From what I've read on these boards, If you've had Tablets, you should do fine with the N900. The community is really helpful, but rough edges do show.

The current wait for PR1.2 is particularly bothersome, as it feels like everyone is waiting for that before pushing forward. That said, My N900 is quite powerful as is. It's not like anything stops working without updates.

I have no problem with battery life. I bought 2 spares 10-12 weeks ago {they're very small in a pocket) and only fully drained a battery a handful of times since. I haven't needed the 3rd yet.