@charlie_lab
I definitely prefer the new one (ZFS Madness) and that is what I use on my servers and laptop, mostly because of the ZFS Boot Environments which are now possible on FreeBSD with
sysutils/beadm port.
ad0 (generally adX drives) were used in the past if AHCI was not enabled. As AHCI support has been implemented in FreeBSD the drives are ada0 (or adaX generally) to distinguish them from adX drives without AHCI enabled. Probably the best part of AHCI is the NCQ, which can be described here:
http://expertester.files.wordpress.c...x-ncq_svg1.png