I shoot a USP9F in my range's montly pin shoot. When I shoot the Remington +P (or +P+, I don't really know) 124 gr. Golden Sabres, I don't give up anything to the folks who shoot .40's and .45's (about everybody else). About the only bad thing is the price of these rounds.
Several times I have had folks come up to me and ask if I had switched calibers from 9mm or wonder about the kind of ammo that I am using.
On a side note, the +P Hydrashocks don't do as good as the Golden Sabres, and I have yet to find a satisfactory ball load.