I'll keep mine to till it stops working. Afair the nand chip can be written to from 10.000 -> 100.000 times and then it stops working. So it should last some years to come dualbooting maemo/nitdroid, hence it flashes the kernel each time booting into another OS.
It wasn't the best phone i've had, hence i missed some what calls, but it still gives me options other phones can't. I even made a few locksliders for my android phones in gimp
The N9 is great, but not in the ways the N900 was/is. The N9 is way to close mass market smartphones, by this i mean the whole feeling it gives me.

Regards Dousan..