I have the irritability and anger version, nothing fun about it. I have experienced one period of euphoria, though. Grandiosity through the roof, planning and high energy, reduced need for sleep, racing thoughts and inability to concentrate or stay on any one project for a while (good thing I can delegate at work before I completely lose the train of thought). I've actually come up with some good stuff when hypomanic, and also a lot of crappy ideas that I was positive were the greatest thing ever. Then I have these moments of insight and feel so embarrassed and humiliated, just want to isolate and not talk to anyone -- that's usually on the downward slide. I haven't had an episode in a couple of years, since my Lamictal dose was cranked up, although I've had a couple of periods of moderate depression.