Reiterating the GP's point, I don't see anything concrete about speed and stability. Let me throw in my 2e-2 USD. I've been running BTRFS on my laptop since Ubuntu 12.10 came out without any troubles. Installing Ubuntu on BTRFS was effortless and I even rigged up a script to do scheduled snapshots of my home directory (hourly, daily, etc.) and found this feature to be very handy a couple of times.
And i started using btrfs in 12.04 and reverted back to ext4 in 12.10 because it was awfully slow. Atleast noticable slower then ext3 (or 4, not sure what i had earlier).
May have changed today, but yes.. It's not all great and nice for everyone ;)
