I got in touch with ArchLinux, when I was porting some linux embedded firmware from sysv/upstart to systemd.
A lot of questions, I googled these day, were answered with a link to this wiki.
So I gave ArchLinux a try, and installed it on our embedded hardware. I planned to use it for our further development.
And now for the bad part:
Unfortunately it toke just a few days, before this rolling release stuff broke the system. The kernel update to 3.19.2 seems to detroy the btrfs beyond repair.
I trying to reproduce this problem right now.