Literally just got off of the phone with someone who had a FreeNAS bug cause a system to become useless, just like the one case that happened today. But instead of it being the JPE encouraging a mistake, the same problem happened through a GUI bug. One of the big risks that the JPE introduces is that the GUI is all "extra" points of failure and has nowhere near the testing of the standard OS tools. So a little big can cause a lot of damage, as it did. The entire SAN had to be replaced due to a small bug in the FreeNAS interface.

It's pretty solid, but I don't like it compared to just using FreeBSD. The web interface brings problems and doesn't really buy you anything. Not like it has additional functionality.