Well, you might recall I got a Mac powerbook maybe a coupla months ago, and that I also use SuSE Linux on an IBM Thinkpad T40.
In general, anything not very vanilla, like digital cameras or my Handspring Treo, works fine on the powerbook. Multiple screens work after a little fooling around.
Devices like that generally don't work well, or at all, on the Linux system. On the other hand, the new kernels might catch up fine.
However, most of what I do, nearly 100%, is email via ssh (secure shell) to our email server, then I use Pine, or use our web applications via the Firefox browser. For reasons I don't really know, the Thinkpad running Linux is significantly faster.
Also, the thinkpad keyboard, with a trackpoint and touchpad and two mouse buttons, seems a lot friendlier than the Mac equivalent.
Mac support has been weaker the expected; I'd suggest that if a customer service person commits to following through, they should do that.
I don't know how this'll go, but for now, I have two systems on my desk.