I've been using a Mac as my personal computer since late 2003. It's been fine for all of that time, but recent releases of the software are starting to make me want to go back to Debian or Ubuntu, warts and all.
Every time I restart my machine, it forgets my trackpad settings.
About one time in ten I wake my machine from sleep, it shows the beachball forever and never comes back.
Combine that with the lack of a compiler shipped with the machine by default, and Debian is starting to look downright attractive again.