Glad I did...
Upgraded from a G3 B&W and I am quite pleased. At first I just stared at it a lot and thought, "3300$?!?!?" (1G Ram, AirPort base, etc, bags, etc, etc...), but I've come to love it.
I'm backing up 220G of music, and I have some gripes with the DVD-R, but if you use decent media, you should be OK. Memorex and TDK have been the best, CompUSA and Verbatim the worst, but I've had nearly 1/4 fail, and at 1.50ish each, that's not cool.
The keyboard is a bit far from the edge and squared and my wrists get annoyed by it, but this forces me to use that hand posture I should've had for years now. Check it out at a store and see if this could be a big problem for you. there are probably rests that can be bought for this anyway.
The screen is beautiful, I bought an AC power adapter (70$ish at Best Buy) and went on a road trip camping with DVDs, edited photos, and recorded a live set with some musicians in the middle of nowhere.
It's big, friends who've used other laptops say massive, but it is my first. It's made every long trip with me in the Timbuktu sleeve/bag, and been great and continues to be.
Switch now, come to the light... I'm a Mac user for life, but have worked on PCs, and hope to never again. The one caution I have is dependence on iApps. iPhoto is slow and buggy (don't dream of editing with less than 1G free), iChat lacks many features still, Safari won't load hotmail... There are always problems with an OS and its apps. The G5 laptop is perhaps a year away, I say go for it. If you can handle the size, the 17" is really a thing of beauty and flies with ease.
--Sincere