The silly HK proprietary rail on those things doesn't help. If HK is going to continue to make USPs, they should really switch to a standard rail or ditch the rail entirely. Of course that would mean new molds. They're probably still making USPs because they already have the molds and tooling and they are good guns. They shouldn't be the better part of a thousand bucks though.
I like USPs and own one, but it doesn't make sense to shell out that kind of money for something when the same manufacturer has already updated the design.