I've had my NB3 for about 9 months and no real issues. As Gdkitty says, the recorded items display list does get messed up once in a while. It seems to be messed up when displaying by title, but seems OK if displaying by date. When it happens I just display by date until I am not recording anything and then reboot the box.
Some people might argue that it has nothing to do with issue.. but just an observation.
Some people i have heard have some major issues.. both with just the box and with whole home with it.. are over 70% full.
That in itself is suprising to me.. considering that the box holds 2x as much as the NB2 bigest unit did. And that was when it was on the Mpeg2 compression. Now that its using the mpeg4.. it gets almost 2x as much.
So not sure, if people NOT experiencing, have much less filled?
(I have an extender on mine too.. so i have like 15 hours HD on there and only at like 3% :P)