Comments on build quality?
Build quality to me seems pretty good, considering it's price. It feels solid, some people moan about the buttons on the top, but they must be inbred swamp beasts as they are fine in reality.
Screen quality is absolutely fine IMO, it's fine for one or two friendly people to look and play, perfect for surfing on your own.
Touchscreen quality is a bit off, but supposedly the later models have fixed this. On mine I have a line about 1" above the bottom that is fairly unresponsive and can cause double-taps etc. But the most recent screen calibrator has all but eliminated this.
Speed, it's very quick running gingerbread, and when they sort out the h/w acceleration on honeycomb that will be blistering too. I've played a few Tegra2 games and they play perfectly.
Go to a shop and play with one, get them to connect it to the wifi if it isn't already and spend 20 minutes having a good play.
Personally I think they're full of win.