That's pretty much how I'd describe it...There's no middle ground with it, it just hits you and you're high as shit, nodding out all over the place and walking into walls and shit...you cant really seem to find a functional dose....
I remember getting grams of it and being like that for weeks....In some ways, I actually liked it because it was a guarantee that it would fuck you up, but it had no legs to keep you well when the high wore off, the sickness was a lot worse than heroin, and its impossible to do just enough to maintain if you have to work or do something normal...oh, and the whole having it almost kill you every third time you do it thing sucks too!
There was one batch of it I always remember, because it was around for awhile....Just pure white, mixed up clear, smelled like a random pharmaceutical....A few people died from that batch, but there were a bunch of dealers who all had the same stuff....it never became huge news story, and most junkies actually liked it...It came in big white rocks, looked just like cocaine, if that....Even most cocaine wasn't as white as this shit...it looked fake, tbh...
The dealer actually stopped selling it to most people, but still had a bunch leftover... He kept selling it to me whenever I'd ask for it though, and after a month or so of shooting that stuff everyday, I couldn't even feel any of the other dope I got for a few weeks...
Another batch I remember....There was this kid that only sold 20s, the bags were small and the dope was usually shitty....he was a last resort that I'd only call in a pinch....One day, he sells me this tiny little bags, again with bright snow white powder that mixes clear....I had a huge tolerance at the time, and could easily handle 4-5 20s....Just one of these little bags instantly knocked everyone on their ass, it was even stronger than the other shit! Sure enough, that batch ended up killing some girl, but that kid actually got busted with it...
With those batches, I'm pretty sure it was straight fentanyl with no heroin, but its probably even more common that it ends up mixed in with real heroin....If you do some heroin and instantly feel like you got knocked out by Mike Tyson, without the warm feeling heroin gives you, that's what its like!