I've just put them on my 125B, the compression damping seems a bit light-on, I have put heavier 250B springs on but the lighter of the dual springs still seems too light.
I'm thinking if I find a stiffer primary spring that it may fire back too hard for the rebound damping?
For the price I think they are definately worth a try, if I was a serious racer though, I'd get something with more adjustability from Walter.
I've got the 15" 13-1240B model.