I wouldn't mix with benzos, would be a east of good barbiturates as it would reduce the "good feeling".
Also don't take it on Ritalin unless you are 100% down.
I for one, am in butalbital right now, and find that it feels nothing like being drunk (which is great because being drunk sucks).
I've never experienced the delayed reaction but I take it 3-4 times per week so you may only get a delayed reaction if you don't do it often. For me it kicks in fully after about an hour.
It really has a high all its own, but the closest thing I would compare it to is opiates (as far as the feeling). It doesn't feel like opiates, but that's the closest comparison.
It makes me feel nice and relaxed, pain free, but with energy and a drive to do things. Also makes me feel just happy.
I mix it with bupe, caffeine (in addition to the caffeine in the particular pills I get), and lots of nicotine for best results.
I'd only mix with bupe or opiates if you have an opiate tolerance though. Unless you mix it with a low dose, then that is fine. (Or if you get the butalbital with codeine you're set).
But yeah it just overall feels great.
But seriously don't take it with benzos, it's a waste and you won't really experience the euphoria-- you'll just get more zombies and possibly puke.
Wait til you're off of the benzos, you'll be glad you did.
If you are addicted to benzos or something or for any reason must do them-- take only a low dose with the butalbital, like .5 - 1.0 mg kpin.