I picked up one today, and so far, here's the downsides I've been able to discover:
1. It can be a bit sluggish at times.
2. It doesn't charge via USB
3. Its pretty easy to knock the charging cable out of the tablet
4. The installed appstore is GetJar, which is a pain to find anything in, IMHO.
5. It won't run Flash. This is a bonus, IMHO, but I know many people want Flash.
6. Resistance-based screen, rather than capacitance, so no multi-touch, and I think that this is what's responsible for the sluggish nature of the device, rather than a lack of processing power.
7. Find apps which will work on it in the app stores can be hit or miss (You can get Angry Birds to run on it, but Netflix is unwatchable and some apps just won't install at all via the app stores.)
8. The screen rotation is a bit crappy
On the upside:
1.
These instructions do show how to get the Google Android Market on the tablet.
2. You can plug in an external keyboard and mouse if you wish. (It doesn't seem to be sluggish when using a keyboard.
3. You can also load the Amazon App Store if you want.
4. The display resolution is at least as good as my HTC Aria's if not better.
5. Its fairly light in the hands.
6. It comes with two USB cables, 1 wall wart adapter, 1 pair of headphones, a stylus, and an elastic sleeve cover.
7. You can play Angry Birds
If someone can figure out how to root the thing and put out a slimmed down ROM for the puppy, it'll be a decent tablet.