I can help u on this! I've had 2 barbs, phenobarbital I used the most b/c of easy availability maybe around 15 doses/times or so and amobarbital which i've only had on 3 separate ocassions. Also had butabital in the form of fioricet (sp?) mixed with codeine which wasn't anything special plus it wasnt a straight up barb.
Now when you compare phenobarbital with amobarbital is like comparing mexican schwag/shit/brick weed with top grade Holland or B.C. Bud. Its incredibily different and you will think all barbs are a waste of time if you expect pheno to be a good intro to the barbiturate family.
I wouldn't say pheno is a waste of time though b/c in my opinion it does have some medicinal value, perhaphs not very euphoric or recreational but definaltey usefull. Back in my home country barbs are still widely prescribed, amobarbital is given for insomnia and has become one of the most widely abused pharmaceuticals, while phenobarbital CAN be given for insomnia it generally isnt b/c of the long half life so something like midazolam/dormicum is given if not amobarbital for such purpose, rather pheno is given for people who need to be sedated 24/7 and who have no chance with shorter acting drugs or even long action benzos like diazepam which is took weak for certain people in terms of providing the same relief as phenobarb does. A neighbour of mine that lives 2 apartments above me back home is prescribed 200mg at night (100mg 2x) and he has been for a while now ever since he lost his arms in an accident at work and went on dissability. He generally cannot drink very much as he risks the possibility of coma and so he has to be careful about his drinking.
The thing I don't enjoy/hate the most about pheno is the EXTREMILY long and lingering effects which if you take a relatively big dose (150mg-300mg) you will feel it for up to 3 days. The reason I dont like this is because of the interactions with other drugs even if you want a drink for example like I mentioned you need to be very careful. One night back home I had drunk with some of the guys from our building a good amount of beer about 4L in like 2-3hrs plus smoked a bit of hash on top and wanted to go drink more since it was like 3-4am and i wanted to fall asleep instead of stay up the night but they had drunk enough so I was left alone with the one neighbour that takes pheno who doesnt go to sleep until after 4am. We smoked a bit of hash, ate more sunflower seeds on the front bench, walked 4min to get something to eat and some more beer to have just in case (though we didnt drink no more that night). I had taken my clonazepam already at least 2hrs ago and I still wasn't sleepy making it a whole week of going to sleep no earlier than 5-6am each night and I thought for sure phenobarbital will put me out. My friend was a bit afraid of giving me any b/c I had been drinking (he was too but I had a lot more to drink the he did), in reality i was buzzed (very) and if i had were to have another 0.5L-1L (half litre to a litre) of beer i would have blacked out type of drunk. After more convincing/nagging I got 2 pills of pheno to take for sleep, I took both and shortly after went to sleep. When I woke up it was 8pm+ the next day and the phone had been ringing all day, I felt the pheno still and felt it for another day afterwards. It wasnt until the next day I realized how lucky I was that I didnt drink another beer the night before or else that would have been it, straight up coma, reason my friend was so cautious and is with himself when drinking.
Be careful with pheno, other than that I dont mind a small dose of pheno. I dont like a big dose of pheno made for sleep b.c its too long, kinda dirty feeling and many things/interactions can happen from a big dose. I do feel that a small dose pheno is quite nice even on its own, by that i mean something under 150mg, prob more like 50mg-100mg at the most.
The effect is nice and calm however in no way representative even in the slightest of how true barbs feel (ex amobarbital is amazing) however it is enough to have you relaxed and stress free in a way different from benzos and perhaphs just as euphoric as benzos (no more no less, some may argues that its less).
One more thing to add about pheno is that on its own its like I said a mild tranquilizer however I have heard (not tried) that certain combinations can be amazing. I remeber hearing Soma (carisoprodol) mixed with phenobarbital was supposed to be quite an euphoric high through never got to try it.
Amobarbital is amazing, it is VERY euphoric and its almost like opioids except when you go to nod out chances are 90% you will fall asleep, i did so within the first 5min of nodding out all 3 times i tried it.
If you need any more specific question feel free to PM me, hope you found this helpful