ZDNet posted a hands on article of the Btrfs file system
Btrfs is a new file system for Linux, one that is still very much in development. Although I wouldn't exactly describe it as "experimental" any more, it is, as stated in the Wiki at kernel.org, "a fast-moving target".Btrfs hands on: My first experiments with a new Linux file system
It has also been said publicly that the basic format and structure of the filesystem should now be stable; it would only be changed in the future if some overriding reason or need is found.
The point of all this should be clear — it is still very early days, and it is not recommended to use btrfs in critical systems of any kind.