I had a brief play with the Galaxy Tab yesterday. Not enough time to form a complete view, but enough for a general impression of the device.
I liked the build. It felt solid enough and like it wasn't going to fall apart on you, but perhaps not as design conscious as the iPad. The display was good and reacted well to re-orienting the device, but what was really noticeable was that it looked a bit like a x2 display on the iPad, but for the whole GUI for the OS.
I know that Google have said that the current version of Android isn't built for tablets, and perhaps this is why it looked like that.
I had a play with the market place and inevitably found a bunch of music apps that I hadn't heard of and now would like to try out.
Anyway, it was a brief look and I did think the device was certainly going in the right direction for Android tablets.
Personally I'll wait a while for an Android tablet, at the very least until after CES to find out what arrives.