I love this amp. There really isn't much to complain about. A lot of people don't like the fact that it only has one knob (volume), but the amp really does the rest of the work for you, so there isn't a need for any other knobs to be on it.
The review before mine states that the amp is limited to a distorted overdrive. I have to disagree. With my guitar plugged into the low input at a moderate volume, this amp is creamy creamy creamy. At the high input, the amp pushes out that warm, thick fuzz overdrive that I personally crave. If you find the amp a little too edgy, just swap out the 6v6 tube. Actually, Sweetwater just wrote an article about that. Switching the stock 6v6 tube with a Tung-Sol or a JJ really does change the amp noticeably. And while you're at it, you might as well swap out the 12ax7 in the preamp, too. Trust me, once that's done, you'll be amazed at the gobs of warmth that ooze out of this thing. But all in all, amazingly, this amp still holds its clarity throughout the entire frequency range. So, for my review, in not so many words, my only advise would be: buy this amp.
Oh, one other thing. The review before mine states that the amp tends to crap out at higher volumes, esp. in regards to the low end. I haven't pushed the amp enough to know, since I'm only using it to record, but if you need the extra volume, the sound of this thing vs. its price tag is more than enough incentive to justify buying a cabinet for it. I may do that myself one of these days, but for now, it works just fine for my needs.