Well, you asked, so here is my opinion/experience! Sorry, it's looong
I was on Aropax for about 3 years then Effexor XR (an SNRI) for about 3 years. First aropax pill I took I called the poison info line 30 mins later (figured it was quicker and more convenient than getting to the hospital emergency dept!) because I began having uncontrollable muscle spasms. This was about 1996 - if I knew now what I know about SSRIs there is no way I would have taken them. Well maybe I would because I would get to the point where I was so fucked, I couldn't think, or speak (literally) and could barely even walk at times. I was taking them for major depression (hospitalisation level stuff) severe anxiety and social phobia. But only started after the worst was over, but I was still very unwell. They did not do a thing for the depression or the anxiety! I had a few panic attacks when I was taking them and I'd never had a panic attack before - or after. Got bad agitation, and although I had been suicidal, I got weird obsessive ideas about suicide, was not even particularly depressed when this began, it was just fucking weird and not 'normal' suicidal ideation. I think not so long after this it was recognised as a side effect of SSRIs. And I put on about 30kg in about 3 months - that was so great haha. Spent a week in bed while withdrawing from them.
Withdrawing so the pdoc could put me on Effexor! It is the worst! I started on a high dose, about 300mg a day, the arsehole psychiatrist did not believe a word I said about how shit they made me feel, (she had told me, as had another doc, I'd have to stay on anti-ds the rest of my life anyway because I had a major episode at least every 2 years and they usually lasted about 6 -9 months each time) and just attributed the stuff I was feeling to me, I was just fucked so obviously needed more effexor. Riiiiight! And they are so hard to get off I just kept taking them, was on over 400mg a day eventually.Which was over the recommended highest dose - doctors orders, fucking cocksucker. I basically begged to have electroconvulsive therapy instead of the drugs, at least that is proven to work, at least for a while anyway, and I was seriously prepared to lose some of my memory rather than take the drugs, but the pdoc would not even consider it. I got fucking terrible side effects, I not only got the brain zaps when getting off them, but the entire time I was taking them - 3 years. Still had bad anxiety, the depression had improved but the bad episodes always stop eventually after however many months it takes, so I do not attribute anything to effexor except fucked up side effects. And I would sweat like anything, had to get up and change the sheets at night because they would be soaked. I don't remember much else in detail, which I'm glad about, but there was other stuff.
I had (hypothetically

) been a recreational heroin user for about 10 years at this time, and the only thing that stopped me feeling the side-effects was h, so I ended up with reasonably big habit because it stopped the brain zaps, well stopped me feeling them anyway, so I made a conscious decision and decided I'd take my chances with a heroin habit rather than with effexor's side effects. H withdrawal was a piece of piss compared to the effexor and I had been using at least 2 grams of h a day, 3 or 4 or 5 grams if I could get that much, for 3 years when I stopped then. And I was lucky that money was no problem either-my boyfriend at the time had a job that paid really well -once he got over handing over hundreds of dollars a day to me I pretty much had to stop, and that meant I had to get off the effexor too, so it was good that he finally got sick of his money going into my veins!) I was also lucky that I moved overseas and avoided the Aus heroin drought! Ok, I say lucky, others would not put it that way, but yeah heroin was a lifesaver for me because of this shit. Probably literally a lifesaver.
NB:
I do not recommend using heroin to deal with SSRI/SNRI side effects or to deal with any problems whatsoever!!!! Heroin is addictive, and many users (the majority probably) I have known, or know are dead now, or in prison or have been in prison, have sold themselves on the street and other shitty, terrible, sad things have happened because of h addiction. Just wanna make it clear to any non-users reading this in case what I've said makes it seem all cool and no problems - I've dropped a few times- been clinically dead and have crushed nerves in my leg after ODing and lying unconscious for about 40 hours. So it's just dumb luck I'm still alive after some of those incidents. I seem to be able to withdraw from it pretty easily for some reason, it's still completely fucking unpleasant to say the very least, but I've done it a few times and I can deal with it no problem. I know for other people it can be absolute hell - I've seen it enough watching friends go through it again and again and again, often with with no success and they're getting on the next day.
Took months to feel normal again and for the brain zaps to stop after stopping the effexor. I also had to go on anti-psychotics for the first month of tapering off it - I was going quite mental and got really severe agitation, banging my head against the wall to make it stop type stuff. Totally fucked up shit! But after my brain was normal again and all that shit was out of my system I was totally fine and felt perfectly normal again.%)
I think it's pretty well established now that SSRI's effects are just very marginally more effective than placebos. I read a few of the meta studies (but that was a few years ago sorry can't recall any details but some could be available online outside of databases etc to read for free), and basically they don't do anything! Except make billions for big pharma. So if they are working magic for some people I would guess a sugar pill would probably work just as well. Some people are just lucky and don't get the side-effects. Maybe just the simple fact that someone is being treated and seeing docs etc is what causes them to feel better? I can't believe it when I hear people who have nothing even close to major depression or debilitating anxiety or OCD etc are being prescribed these drugs. WTF?! So Lagger, yeah, handing them out like candy is right. To people who have serious life threatening major depression maybe I can understand, maybe the the risk is worth it. Maybe not though! I've heard of/met people who are sad, just regular sad (yeah that's fuckin' life and sometimes shit happens. Surprise!) cos of a relationship breakup or something getting prescriptions

People need to harden the fuck up if they think feeling sad for a normal legit reason means they need prescription poison. Talk to someone, do something, exercise, anything, just don't torture your poor brain with that stuff unless you're really really gone. And even then I'd say don't bother with it. And btw I think only psychiatrists should be allowed to prescribe the stuff, not GPs.
Anyway it's 9 years this month since I got off effexor. Woot! I'd had problems with major depression since I was 13 and have not had another really severe episode since 2001. Helps that I have understanding docs who don't treat me like a moron or a junkie even though they know my history and that I do still use on the odd occasion and they are not anti benzo Nazis. Keeping the anxiety under control with xanax when necessary has been the reason I've not had major depression again I think. Social phobia and anxiety would get so bad that I couldn't leave the house for months and months, not even out the door to get to the mailbox, so I had to quit jobs, drop out of uni, break up with boyfriends etc and then the depression would start because my life had turned to total shit. And it turned out I have ADHD too, no psych doc ever picked that up until relatively recently (well done all you psych docs

) and it can cause depression and anxiety and all sorts of problems because people with ADHD don't do 'normal' life so well. So to sum up, no they did not work for me, it was definitely not worth it and FUCK EFFEXOR and all of them! And as I have told my GPs and pdoc, if someone ever tried to put an SSRI or SNRI in my mouth I'd kill them before they could do it. And I'm only exaggerating
slightly
Bet you're sorry you asked the question now? Or sorry I answered you at least? (or ranted on an on and on, call it what you like!).
And you're right about psychs giving different/wrong diagnoses. Some of them can try and pretend it's all hard science, but psychiatry just ain't! Have you read about the Rosenhan experiment? Check that out for one example. Great stuff!