It isn't bad but if you ain't got a tolerance it could fuck you up and knock you out until you wake up thinking you are normal but you aren't and do dumb shit. Very inhibiting. Can cause violence. It's not as euphoric as Etiz. Kpins are childsplay compared to it. It's a real benzo for real junkies.
My brother once completely lost his shit on it and destroyed his place. I woke up to the sound of shattering glass and went downstairs to find him with bloody knuckles, surrounded by trashed stuff. He didn't even have a reason. He was just pissed off and didn't care at all.
It never did that to me. It was pretty chill as far as I can remember. (Zonk)