I use my N900 and only it. And I will be very sad if one day it is screwed... The usb is ok for now (cross fingers), the system ok but hardly upgradable with recents repos aleas.

I use it for everything, I like the 32gb storage, the keyboard, the open plateform and the lovely maemo system. I regret some bugs, even with thumb2, the small battery life (I use 3 batteries a day) and some sloness (particularly when a call comes).

@rebhana For the sync with google agenda, I use Erminig-NG and alarmed ('erminig -a' command) for 2 years and it works almost like a charm.