Small, but with a sound that can fill a room.
I got the THR10IIW for practicing at home, using low volumes. The amp does this beautifully. The sounds you can get from this thing are impressive for such a small box, even at low volumes. There are enough knobs and controls to do anything you'd expect from a practice amp.
Wirelessness is awesome. So much fun to jam around, free from wires.
Pricing. I think you get good value for the price.