Last time I tried one was in the Joris OC razor and that is an aggressive razor, was just for kicks to see how it fared and went well. However they work well in both the EJ and Merkur range and the vintage ones, they seem to be a good all rounder and I often use one of these or a Red IP depending on how I am feeling that day.
I first tried them as part of a sampler from Paul at Connaught and found they gave me a very comfortable shave.
They work really nicely in my EJ DE87 and easily give me 4-5 nice shaves. A good balde for me
regards, beejay