No jitters, keeps me focussed, allows me to post ungodly amounts of porn, nice even euphoric buzz, consistant energy level....I could go on, and on, and on....
I should say I am up to 3 after 4 weeks, reason I jumped up so fast was the samples that I got were bigger and noticeably stronger even though I was told they were not. so I had to jump to 2 to feel the effects of the samples.....never made me feel like crap though.
The app supression works for me too, I've just never experienced anything bad from them I guess......yet.