I wouldn't say that vomiting from pills is a "really nice feeling"...
I actually find it really unpleasant...normally my entire body shakes and shudders, and the feeling throughout me is like that of a really strong rush, but very harsh and unpleasant.
After I've vomited everything is usually okay, although once I did have terrible recurring stomach cramps and dry wretches which really put a downer on the evening. Also, it's possible that I'll vomit more than once in a night.
Last time I had pills I vomited three times. I had a half and vomited...then I dropped a whole and vomited again...then I snorted a pill, in thirds, over the course of about an hour, and vomited again. It's an absolute pain in the arse. Next time I'm going to take some quick-eze and hopefully they'll make a difference. Puking so much sucks and is making pills a whole lot less fun for me.