I've got this drive in my M9. On the plus side, the OSX install went without a hitch. Everything works. On the minus side, it's slow. Really frakkin' slow!!
Using OSX 10.5.6 with 2 GB RAM, it takes 3 minutes 44 seconds to full boot. When navigating through the finder, icons take their time to be drawn when opening folders like Applications and what not. Clicking on icons and the dock are met with a 1-2 second lag, making you click twice to make sure that it actually worked.
The spinning beach ball shows up with alarming frequency when opening and closing apps. Skype barely works. When playing .avi movies with VLC, it stutters and freezes every 3-4 minutes, resulting in another minute waiting for the screen to redraw.
So count me along those who ordered a RunCore and will be watching the mailbox for a small packet from Hong Kong. Maybe should have ordered it built from Dell...coulda got a 64 MB for that price!