I bought one about 3 weeks ago. To answer your basic questions, it does come with a "wall wart" power supply, there is not a battery option, there's no case, and I think it sounds pretty good running direct. But I usually just run it into my amp.
It comes with 99 presets, and you can create 99 of your own, I believe. The presets are a reasonably good mix of heavy and light effects. I've found several that I really like, although I'm sure there are also dozens that I'd never use in a gig situation. I expect I'll end up with a half-dozen that I use regularly, and I'll ignore the rest. There is also a "performance mode" which, I believe lets you have 3 different presets at your disposal without having to "scroll" thru the ones you don't want. Haven't tried that yet.
It has a nice sounding headphone output, which I've used a fair amount for practicing at home. I only wish that it had a line-in so I could play along with my iPod.
I like the built-in tuner and I like how easy it is to switch into tuner mode. Should come in handy at gigs for double-checking my tuning during short breaks.
It's a bit larger than I expected, about 7" x 7" by 3". Feels pretty solid.
I was looking for something in the $100 range that gave me lots of options without too much "tone suck", and this fit the bill. Overall I'm happy with it so far.