Hi all. Just want to pass on my experience upgrading the HD of my newly purchased Aluminum MacBook 2.0. Install: "A breeze" is an understatement. I never experienced upgrading anything on my computers this easy. I wouldn't even explain the process...my cat can do it...hehe... I opted to install a fresh Leopard then migrated my files from my MBP 2.16 Core2Duo via Ethernet. Performance: At first, I didn't notice the speed difference but once I started working on things, the speed jump was obvious. The MB was snappier opening files especially big ones. Important Note: I had a little problem restoring my Time Machine back-up from my MBP to my new MB. I first opted to restore from Disk Utility which took about 2 hours. Afterwhich my MB kept booting repeatedly, with the old Apple Logo and sound. Found out, I should have done this when Leopard prompted me for a "migrate" after the fresh install, or just simply migrate after installing and updating Leopard. There you go. Just a first hand experience. Next will be a RAM upgrade to 4 gigs.