I've been really intrigued by UWA lenses lately and have been looking into possibly getting one (the Sigma 10-20 4-5.3). However, I've never used one before and am trying to figure out realistically how much use it would get. I don't really take too many landscape photos or anything. I do take a fairly good mix of stuff though. I just think the perspective from an UWA is pretty awesome.
So my question to anyone who owns or has owned one is: how much do you actually use it? And what type of photos do you find yourself using it for?
I've seen lots of great examples of what they're capable of in some of the UWA lens example shot libraries, but am trying to get some realistic feedback.

