I have windows 7 installed as well, dual boot. Sometimes, like once every month I use windows for 20 minutes, hate it and reboot into linux.
I use mac at work but mostly as a radio (www.di.fm)
Radiant is exceptionally stable in Linux, it's crashed twice in 3 years, usually after using one of the plugins. I can run some windows applications like 3dsmax7 in linux (under wine, performs better that under windows).