I loaned out my Mühle black fiber bush approx. a year ago and just recently got it back (long story). Now mind you I bought this back in the Fall of 2014 when it was "cutting edge" and used it like a courtesy car to cathouse for nigh onto two years. It never let me down. However, after this last hiatus I used it last night and I have to say that it is most certainly dated. The successive generation(s) of synthetics have left it gasping for air. It felt prickly to my face after two years of successive & better synthetic brushes. I will however continue to utilize it as a loaner for newbies, but other than that it has clearly gone the way of the flintlock.