I've now had my N810 for a few months, after having had (and continue to have, but rarely use) an N800 for a few years. The GPS seems to work very well for me, I use it all the time, just for fun.

The other day I discovered myself outside of a library with one bar strength of wireless coverage there in the parking lot. I actually got connected to the library's wifi and could read the NY Times while I waited for the census-takers test to start. I don't think I ever had that weak of a connection work for me before.

My dislike of the physical keyboard has diminished, though I still use a virtual keyboard most of the time. I sent off for a screen protector, but ended up throwing it away because it messed up touch response a lot.

I couldn't get Penguinbait's excellent, user-friendly instructions for booting off an mmc card and cloning to work. I've had it working on my N800 for ages. I'll try that again, but it's not so bad without; I can run an awful lot of programs without resorting to the mmc boot stuff. (I even tried the PB system IMMEDIATELY after flashing the N810 and it didn't work -- and I did turn off virtual memory, of course -- maybe there's something wrong with the sd card, which is formatted ext3, of course.)

All in all, I'd say that the N810 does a much better job of living up to the promise of the N800, though it has a way to go before becoming the really cool and essential device it should be. I don't really need the N810 in my pocket, since I have a Centro that carries me through any emergency, but the N810 adds some fun when I have spare time.