Usually, as most would know from reading my posts, I'm fair in my evaluations that PC's and Mac's are fairly equal and have their ups and downs.
BUT HOLY CRAP. A company just made me work with some quad core pc's and Premiere CS5 to edit some footage for them (Shot in 1080p 59.94i) AND IT WAS AWFUL.
Windows crashed 9 times. Premiere crashed 32 times, froze 46 times (couldn't even play through an unrendered cross-dissolve). And I tried 14 different workstations at the studio. The results of above were a combined total on EVERY computer.
If you are doing HD video editing EVER, GET THE MAC.
That feels unusual me being so biased...but when you save every 10 minutes and premiere crashes and your entire project just vanishes with no possible recovery...you'd come to my conclusion as well.
*If you're just using it for home use: office, notes, internet, etc. than I would say it was not a good purchase at all. Get a $249 Compaq laptop from walmart. It handles itunes, internet, and microsoft office plenty well. But video editing, since I'm being biased right now, your purchase was the correct move. Though I will agree with the one post that said the 13" is the worst value of the macbooks. 15" pro would be my personal choice - though I have a 13".