openSUSE 12.1 Btrfs Snapshot.
I was skeptical so I bought a 1TB Western Digital Black to test it. I loaded the system and ran it for two weeks. Then I changed hardware going from AMD to nVidia. Onboard sound to Audigy2. I deleted pulseaudio. I purposely deleted .conf files. Then I put it back to the original hardware and ran Snapshot.
Snapshot worked great. I am now a believer. I even screwed up and it worked. I should have probably logged into Failsafe to do it seeing that I was messing with graphics cards I lost the graphics. I had a black screen with a mouse cursor. Not a real problem I gave it an hour then rebooted to a perfect system. I don’t really know if Failsafe would have made a difference or even worked. Another day I guess. Maybe someone else knows the answer to that question. I do know now that Btrfs and snapshot is worth the install consideration because it works.
Thanks for the testimonial. I have been on the fence about btrfs myself; I think if it is well tested and recommended enough I might move to it for OpenSUSE 12.2. 
The feature I am most interested in is transparent lzo compression.
BTRFS is still a bit unstable look at many reports of problems here. So far I have not seen the fsck programs need to fix corruption problems. I’d be real careful about using it on a production system.