Good experiences: only way back when, really, using benzos on an occasional basis to either put an end to stimulant comedowns or potentiate fairly low-dose/mild opiates.
Bad experiences: 2 years of addiction, peaking at insane binge doses (I won't even post the numbers, it was that dumb and pointless), blackouts and hallucinations from taking Lorazepam and smoking strong skunk to come down from three-day speed runs (like full-blown hallucinations - golden glowing Jesus-figure appearing and laughing at me, doubled over with hilarity, while I smoked a bowl and thought wtf? wtf? wtf? Get outta here, man, I'm Jewish too), using too much Xanax and Temazepam to potentiate Oxy, being roughly shaken awake by my mom after I'd nodded out with the door dead-bolted and she had to break a window to get in. Most of all, though, the ongoing headache of tapering and relapsing/binging: right now I'm trying to get down from 40-50mgs diaz to 30, and having had 10mgs this morning, it's over 4 hours till my 20mg nightime dose, which won't knock me out: intense anxiety, thank God I don't have to go anywhere. It's encouraging to read of people getting off and staying off, because unpleasant as a steep taper is (only way I can do it, for financial and other reasons), I'd hate to be on these fucking paradoxical blue discs of rebound anxiety and sleep disruption (with habitual use) much longer. Withdrawal is scary - I used to have a profession, now I'm just in self-imposed rehab - but so is the thought of cognitive deficits from long-term use. Finally, idiosyncratic reactions - irritability, increased anxiety regardless of dosage, and all the other unexpected shit that comes from daily use.
So I'm with Aphex: Benzos have very limited recreational use, IME, and unless taken very infrequently for anxiety or comedowns, are an insidious reptile of a quick slither into addiction that can fuck your life up completely without giving much in return by way of highs. Best avoided completely by those of us prone to addiction, perhaps especially those with a history of heavy drinking: all I want right now, like over-riding any professional or romantic or spiritual aspirations, is to get to a place where I can take my last valium, let the after-effects post-cessation slap me around for as long as they have to, and slowly piece my life back together. I hope I won't experience years of rebound anxiety and insomnia once down to zero...and if I do, that I won't weaken and relapse. This habit/breaking it has come to dominate my daily life almost completely, and I feel depersonalised and the world around me seems frightening and unreal as I drop doses - it's been a total, crippling waste of time and money, and the worst thing is, I knew the risks when I started, but was too depressed to care.
Fuck fucking benzo addiction, it's so easy to fall into and a long hard road to get out. But thanks, Aphex, it's reassuring to hear from someone who's been through this and come out the other side.