I have this set +8+10 and all are very good ,sound is very dark ,short,dry, not much overtones ,and are very durable.I havent any problems with coating clogging on ride that i read somewhere about black coating heads.It seems to me that they are quieter than other types of heads,and maybe little choked but its not a problem. For my ears the 10 sounds best and you can tune in even higher and it sounds still good ,they are best in low tune.Recommend for anyone who search for that type of heads.