Went to the apple store today (66th and Broadway New York), with the intention to but the 13" Pro . I was most concerned to look at the screens, which I was not able to because the store is designed awfully, its a glass dome box of extreme glare. The monitors looked very unappealing, really surprised apple would make their machines look so bad. So I figured I do a speed test, even though I thought I would be happy with the core 2. On the 13", I loaded 3 hd movie trailers in quicktime and played them all at once. They played pretty much flawlessly, but expose all windows lagged a bit, and slowed down the movies. I then opened 25 safari windows (with the movies still playing) and each loaded slower and slower. Realizing that this speed test, although way too extreme for realtime use, is a good test for 3D performance (as good as it could get in the store), editing, encoding, etc. I was sad...so I went to check out the 17" i5. OMG. I had the 3 hd movies up, 50 safari windows, and expose did not have ANY lag what so ever. I then opened another 50 finder windows and still perfectly smooth. I am blown away and I must say the only mac for me is the 17" MBP, I fell in love. I did not really notice the difference with the i7, but I am sure real testing would prove me wrong! I was tempted to buy it right there but realized I would rather go tax free/disucounted off ebay (sealed box) or amazon which is way better than the student discount.