I have a Pauls Klamper on the front of my Airnimal folder. It works like you'd expect a better made easier to adjust version of a BB7 would, with a nicer feel at the lever, it doesn't stop any better, though there's nothing wrong with the BB7s. It's not going to win a beauty contest, or improve aerodynamics, but it looks and feels quality. Available with three versions of actuation arms, depending on the STI's that may be an advantage, it's not something I know much about but as Avid and TRP use the same cable pull for old Shimano, new Shimano, Campag and SRAM, it's not going to be the best match for them all.
Starbike in Germany were the best price and I think they're still shipping to the UK.