The only difficulty was the exchange! I think it could be half an inch larger in diameter, because it went on the headphones in such a way that I thought it would tear apart! I would like to note that this is not the first time I have changed the pads on the Meze 99 classic, because I tuned it, rewired the internal wiring to OCC monocrystalline copper wire, and for this I had to take it apart more than once. + I also pickled the wood with precious oil to remove the "wooden cup" sound that stood out to me. In addition, its appearance has become much more beautiful! So I have practice in it, but I will say this, it is very difficult to put a pillow! The material is of very good quality, I hope it lasts a long time! I didn't experience any particular change in sound quality, but it's much more comfortable to use the earphones, and in warmer weather, /I'm not talking about summer/ my skin doesn't sweat! In the summer, the original ear cushion is very hot, it's almost unbearable! This will be good, I feel it!