Also upgrading from the 15" Unibody here are my muses:
Im actually surprised at how strong it is, it feels so solid, i was expecting it to be flimsyer than the 15" but it simply isn't.
The screen is absolutely amazing, perhaps they are using two different screen brands because the Original Poster here mentioned that theres was quite dim, but mines much brighter than the 15" Unibody, its so bright it actually hurts my eyes when set to maximum literally! Perhaps the OP should review their automatic brightness based on environment settings.
Also on the screen the full High Definition resolution is simply stunning, i know on laptop screens there isnt much point watching HD movies because theyre smaller than 40 inches, but you can still notice a massive quality difference when watching 1080 movies compared to normal DVD's. Its really nice
I got 9 hours out of my battery using the 9400 card with Airport activated, Surfing the Web on Safari, listening to music on itunes, burning a few DVD's in toast, encoding some movies in handbrake and installing Windows 7 and uploading some new content to my site on CyberDuck, which i would say is about medium intensiveness on battery drain so i'm really impressed. I should mention i calibrated my battery even though in the manual it now doesnt mention anything about doing it like it does with other Macbooks

However on Apples site it says you should, even with this 2009 Model.
Finally I should mention its no bulkyer than the 15" and no more difficult to carry around, it actually feels smaller on your lap than the 15" in terms of size because theirs less bezel around the screen

and the extra 1lb weight isnt noticeable for me, but it might be an issue if your a 3 year old girl.