Anyone tried this? Surprisingly, aside from the reliability stuff, ZFS seems to offer a large performance increase over UFS. With UFS FreeBSD has seemed laggy to me on current(ish) machines like my laptop, e.g. cursor lag when installing packages or rendering large web pages. With ZFS, none of that at all. (Funny considering I always had problems with ZFS performance on OpenSolaris... Maybe prefetch related? Dunno.) There's some other nice stuff too, e.g. the new package manager is like apt-get with a cleaner interface. (And also *fast* when used on ZFS.) Two pet peeves so far: 1. BSD userland utilities are less powerful and more finicky than their GNU equivalents. This rears its head pretty constantly. 2. Boot time is sloooow. The FreeBSD bootloader was never fast, and the ZFS version takes ~20 seconds to get to the ASCII boot splash. But otherwise, quite impressive. With ZFS and snapshotting it would be an interesting choice to base a desktop OS on. Edit: tip if you want to avoid problems - disable DRI in xorg.conf. It's enabled by default for some drivers in the packaged X11 version, and that's a problem because it is still pretty buggy on *BSD.