Been using Crunchbang for about 2 years now.
I find the simplicity of the GUI and the fact that the OS hardly uses any resources (80MB of RAM, for example) is awesome. It's like someone made #! exactly to my personal tastes.
My 6 year old crappy Acer laptop flies. Even if I had a better system I would still use #!.
The "super key" is awesome, can load applications without having to mouse around with menu's and even dreaded app dock widgety things.
Reminds me of Slackware, but with simple apt-get package management.
Any other #!er's here?