I switched from C7 to N9 last year as my daily driver, got the 64 GB one.
I got it because I just had to have it because of sexy design, and linux Harmattan is so great to use, love it.
I wanted to learn my through through linux, and do things on the go. I am satisfied with it even if doesn't provide stuff other phones do. It suffices my needs. I do miss things from my C7 like FMTx, USB-OTG, smartdial, 720p video playback

So i would say that if u want a new phone, then there are many better options, but if u are like me, and just have to own an N9, get it(even in 2015), you won't regret it.

A few days back to i switched back to C7, and use N9 not as a primary phone but handheld linux device and gonna use it for development, experimenting and stuff.