I have always preferred 7. Fits into all my jeans' pockets even my skinniest. I can lie down in bed to use it, though it is a bit heavy. But if you want to know what real heavy is try an ipad. Used one for the first time a month or so ago. Was real heavy. If I had that it would never leave the house (without me feeling like an idiot). And I could not really use it lying down. In which case why wouldn't I just use a laptop instead (unless I badly needed some app but given it is itunes would probably not be available free and I am still not into paying for apps).

I have also in the last couple of weeks started doing a lot of ebook reading. And the Tab is the perfect size for that. Really enjoyeable. So enjoyeable that I have decided that I won't be buying any paper books unless the ebook is not available and unless it is an absolutely must have book.

Conclusion: I love the size of the Tab.

Oops forgot one important thing about size: Typing speed. With the 10 inch form your fingers can't to the buttons in the middle. Typing is a very slow and painful experience. The Tab on the other hand in portrait is the perfect size for super speedy typing.