I use BTRFS on my laptop and in case anyone is interested in trying it, please be sure you know how to chroot into the system in case it won't start. Arch Linux had a problematic GRUB package pushed to stable a few months ago and it bricked people's computers by booting directly to the BIOS. Whatever you do, make sure to take notes on the configuration (if it is DIY) because there are many difference between BTRFS and EXT4, so you can't use a normal chroot guide to fix your system.