I’ve been using BTRFS for a few weeks now, and some bits are great (filesystem snapshots, dynamic resizing etc).
The “Good” and “Bad” things follow:
I needed a variant of Squid which supported transparent SSL interception (i.e via iptables redirection) so I could log outgoing HTTPS requests without the client being aware.
The stock wheezy variant doesn’t support SSL (see : Debian Bug Report).
Even after recompiling Wheezy’s squid3 it didn’t seem to work (perhaps my stupidity) so I ended up moving to the latest-and-greatest squid (3.4.9 at the time of writing) and getting that to work. Brief notes follow.