I really liked my Q10. I came to it from a N900 and I found it had the same sort of flexibility under the hood without being cluttered on the surface. The N9 is more a step towards minimalism and that's what I really like about it. The thing I most miss from my Q10 is it could play any media you threw at it and it had an hdmi port to play out on and a SD slot for storage. I've heard good things about the Z30 and I do think BB10 is a good OS.