I generally don't like stimulants very much, except for MDMA which I <3. Not just for the euphoria but also the empathy, eye wiggles, under-water feel...all of it. If you do too much ecstasy though it just doesn't feel the same. I don't mind a little meth in my pills, but most of what I get is fairly clean.
Coke is cut, all of it is. Commonly with amphetamine, caffeine and ephedrine which ruins the high.