I built a FreeBSD 10.1 server with a single root ZFS pool consisting of seven 3 TB drives in RAID-Z3, including a small 7-way mirror of swap space. The process was completely pushbutton using the install UI. Partly I did it just to explore how much difficulty the install might be (no difficulty whatsoever), but the setup has proved very effective in use.
It was pretty cool rerouting some of the SATA connections randomly (even to a different HBA) as a test, and removing two of the drives as a test, and having it still boot to a fully operating state and run fully usably with no intervention or drama at all.
After extensive experimentation and production use, the only real criticism I have that is just head-scratchingly stupid and lame is that there is no sensor capability, and no one in development seems to think there is a glaring problem with its omission. Coretemp works beautifully, but you can't detect fan rotation or access any voltage or secondary temperature sensors.