I've got a minor issue with UnPNP-- with the beta code, my Blu-Ray player will lose track of what folder I was in after watching a show or restarting the player, forcing me to navigate back through the directory structure again. Was never an issue with 1.03.
Playback itself is fine, just this minor annoyance.
I've had periodic trashing as well-- I've got 3 disks in a RAID-5, and one large disk riding solo. When that disk gets to the point of being completely full, the unit will become extremely slow to respond to anything-- it's not dead, but it might as well be, because I have to pull the power and restart.