I waited to handle an RCP before I bought my Ultra CDP. I could not convince myself that I didn't need sights, given the level of practice I am restricted to in an indoor range that frowns on (read: doesn't allow) any sort of tactical practice, like drawing from a holster....
I loved the concealability, but the trench wasn't for me. Of course, now that I have my CDP, they will come out with something between the two. I love the beavertail, but it IS a bit long for concealment. The RCP fixes that.