A1 hardware version. Flashed with 1.21 B3 almost eight days ago and redid all my setting by hand after loading factory defaults. Thus far I haven't seen so much as a hiccup whereas I had to reboot the router with 1.21NA every other day in order to keep from seizing up.
That's not to say there aren't people with valid issues. I'm just happy I don't have to get a new router or play the RMA game.
As for what's on my network, I have a Media PC, 3 Desktops, 1 Server, 1 laptop, one multifunction printer and an iTouch.