I find the coat king very good, takes out a lot of the undercoat. Ellie has been spayed a year now and it is still working on her very thick coat. It does cut the hair a little and can leave some whispy bits, but to me it is preferable to using clippers. I have been told it won't work forever so will wait and see. It has no effect on my other spayed bitch who is very curly, she has to be clipped. A lot of people seeing Ellies coat think she has been handstripped and isn't spayed.