Really? I haven't used a GPS for hiking yet, but I'm sorta planning on going down that road (ooohh!! look, a pun!) and it seems to me that a separate BT GPS unit would be better than an all-in-one device: Better battery life for both devices and you can always velcro the GPS on your backpack. The only advantage the N810 has is its daylight-visible LCD, but I'm confident someone will come up with a solution for N800s for that (and yes: I was the first to suggest replacing the N800's screen with a N810 unit).

To be honest, I've more considered a paper map and a dedicated, simple GPS unit, but I'm a luddite. So there.