The N900 still has some problems that need addressing:

* There is no audio in voice calls yet (or at least just one side)
* It doesn't idle properly, so the battery lasts for maybe 8 hours max

This will get fixed, but my personal focus is first on the Droid 4 and related phones (bionic, droid 3, razr), since we have much more working there and they are more powerful devices.

Ultimately these fixes for the N900 will probably be day-long investigations leading to patches of just a few lines of code.

Long story short, you might be better off with a pinephone or droid 4 for now as a daily driver. I would hold off until the Chimaera release (and the self imposed Feb 1 deadline for when I will personally switch over from N900 Fremantle to Droid 4 w/ Leste).