I just put on a pair of NB 812's that have replaced my 811's. I don't know when I'll get a chance to do some hiking in them, but the initial impression is this: much beefier construction, especially in the toes and tread. There's also a lot less mesh and more solid fabric on the upper, although I can't say yet just how much the breathability or drying time is effected by this.
Anyone else test these out yet? I haven't decided if I think they're an improvement over the 811's or not.

