use them if you want, they are a crap idea IMHO
1; the holes between the mesh are 35 - 40 microns (the gap between the coated elko piston and the cylinder in total is 40 micron so 20 microns each side)
2; our "bypass" valve just returns oil to the gearbox so it is impossible for our engine to receive unfiltered oil (as they claim happens on cold start up)
Ive cut open new KTM paper filters and looked at them closely, the biggest hole I found was about 10 microns .. and only 1.
the tests they do sound impressive about absolute ratings etc and in general the comparison between some paper filters and mesh filters will be correct
but in our specific applciation the mesh filters do ABSOLUTELY have a lot of very big holes while the ktm paper filters don't have any.. not a single one bigger than 40 microns and that is only very occasionally found in the KTM long filters I use.
with all that though the main source of debris comes in through the air filter and some of that goes past the rings into the oil.
so as I have pointed out a few times the overall discussion is similar to deciding which hurts more: a hammer or an axe