I've had one for a few months. Very impressed.

The swiping action to switch apps/launch new ones is very intuitive due to the rounded screen edges.

It feels faster than my more powerful android phone. There's a pretty big range of apps considering it's a niche phone. Including some decent 3d games, spotify, kindle reader, tomboy note taking etc. A bigger selection than the n900 had. There's an excellent terminal for using irssi on with an overlaid keyboard that doesn't take any screen space.

There are of course downsides. It's an obsolete platform, so it's only a matter of time before the browser is too old to use webapps. The email app sucks compared to gmail.