I ride them on this bike mounted to VO Porteur handlebars.
http://www.flickr.com/photos/reefflo...57624058389949
Mine are Dia-Compe levers. All in all, I like them they have good stopping power paired with canti brakes. There is a lot of flex and a little side-to-side play along the levers if you grab them at the ends, but I think they are sound. I've put a lot of miles on them in the year I've used them, and I've tugged hard on them for abrupt stops. No problems.

One interesting aspect to these levers is that when you mount them with porteur bars such that they slightly overlap the outside curve of the bars, you can pull them up even and even above the handlebar, giving a very wide range of movement. Handy if you let your wheels get badly out of true.