I do like OS X. It is very stable (mostly), and very good on the eyes. But what I find rather odd is that for some Unix/Linux aplications, it is easier to find a port to Windows under Cygwin, than it is to find one to OS X under Fink. It may be due to market penetration, but I recently had to try and compile an application for OS X (not available through Fink), which failed miserably and cost me two days. I had the Windows port up and running in less than an hour.
There's usability for you