Not sure if you were referring to the 2 in 1 holders or the actual files. I tried to do a good comparison of Stihl and Pferd a while back. Took close up pics - which lead me to think that the Stihl was going to be better. I sharpened Chain A with the Stihl then Chain B with the Pferd. Chain B cut better. Sharpened each again with opposite file. Chain A cut better. Not a huge study...but it convinced me that the Pferd files do a better job, for whatever it is worth. Some will suggest that I've brought religion and/or politics into the tread by going there, but I'm just passing along my observations