If you use it, what are your experiences?

Is it reliable? Does it work without glitches? I'm mostly looking to use it on two external HDDs. I wont create any pools spanning over drives. I'm mostly interested in the data integrity aspects of the file system.

The installation notes say this:

> Using kernel extensions introduce a degree of instability into a system that userland processes don't encounter; the software has been known to cause kernel panics in the past. In addition, any file system has the possibility of causing damage to files; whilst ZFS creates checksums of all blocks (and so can detect failure earlier than in other systems) there's no guarantee that your data will be accessible in the event of problems.