The Z10 does look just like the Droid X, but I like the industrial design of it: both corporate and elegant. It looks better then the anorexic look of the iphone5 actually, which has way too much wasted space on top and bottom (Apple should have made the home button smaller or even capacitive).
Only the side bezels of this phone are huge, they should have made those narrower and adjust the software if the side bezels are also used for swipes.
The UI seems clunky indeed, too many complex moves, unclear how the OS is structured. The look is also not very original, recognizable and frankly, hideous from a design POV.
To me the phone itself seems like a great device, it's sexy and corporate and recognizable as being a BlackBerry phone, but the OS seems a weak point rather then a strength, and the eco system seems extremely weak as well, even compared to Windows Phone.
Maybe it will be a hit among corporate users like the old BlackBerry phones, and get a cult following again with the (mainly afro/latin-american/european) youth, but I'm not holding my breath.
It does seem to appeal to different users then Windows Phone, which has trouble finding their audience, so it will be interesting to see which of both will take off, or maybe even both.