Didn't own one but a friend had an N900. It seemed like a few things still needed polish, but it didn't seem slow to me - quite the opposite. He hung on to it for a good while too.
My plan was to buy the next one at next contract change - of course that wasn't going to be possible. (I've always had a liking for the Communicator layout, going all the way back to Psion 3s)
I had a Nokia N810 (https://en.wikipedia.org/wiki/Nokia_N810). It was a incredibly good device for the time and left other smart devices of its era in the dust, IMO. The lack of telephony is why I stopped using it but its functionality, perfect keyboard, superb browser, and a proper terminal made it something that I still remember very fondly, next to my Sharp Zaurus SL500.
