Here is the first Samsung Tab review I've seen, over at TechRadar (horrible multipage review, but the content was decent).

Their main complaints seem to be the user interface speed at times wen web browsing, the device gets noticeably warm, and battery life was poor. They were mixed on the size, putting it as good in the summary due to the mobility, but bad in another part of the article due to the cramped keyboard.

One point they made in this review is the Samsung Tab may damage perceptions for future Android tablets due to shipping with 2.2 today, an Android release Google continues to indicate wasn't built for tablets. I wonder how quickly Samsung will get it updated to 3.0.