The thing I like the most is that it isn't that much bigger than the Z10, but has a much bigger screen. Finally BlackBerry has some sense.
Take the Z10 vs RAZR i which I am playing around with right now. The RAZR i is smaller in everyway, width, height, and thickness. Not just a little, but significantly smaller. But the phone has a 0.1" bigger screen and a 2000mah battery. The physical size of the device is similar to the iPhone 5 really, which is really great for one-handed ease of use. Something BlackBerry said they wanted for the Z10, but didn't quite hit the mark imo.
Anyway, personally i'm not that into huge phones. Moto X is probably the biggest I'm willing to go for full touch. But really, I'm more interested if they will make the next Q series flagship.