Overall usability? It does exactly what it is supposed to do and it does it very, very well. I was just showing it off to some friends of mine who had never used Linux or a mobile internet device, they thought it was the coolest thing ever (even after I told them the price). And, since it does run Linux, it does things is NOT supposed to do very, very well.

I love the design of the N810, I really don't thing Nokia could have created a better form factor for this kind of device. If you have one, feel free to share.