That keyboard, oh man that keyboard was very very good, I am on a full touchscreen phone currently and I curse that stupid virtual keyboard every time I have to use it. with a double curse if I have to use it while in a car.
There was not much left of qnx for the user to interact with, sort of like whatever is left of linux in android phones, kind of a hollow shell. however I did like the UI. it is hard to quantify but it felt better designed to be used, a tool. Android by comparison feels more like it was designed to look pretty with usability as a second class citizen. but really it is a minor thing.
I suspect the real advantage of having qnx as a real time os was how responsive it was, not fast, but always responsive, never any lag. but that may just be my imagination.
Edit: I just remembered the square screen, I love the square screen, and it took square pictures, what a great phone.