We only use it once a month or so. A good pin brush works just as well IMHO. Never used it enough to damage the coat. I think more than once a week is a bad idea.
Ack! Yes Rerun, that is what I meant. Dope slap.We use and love it. I've used it for YEARS. I've tried every grooming tool in the book and the furminator is hands down superior for a shedding dog. The "pin brush" - I assume they mean slicker since a pin brush wouldn't do squat on a GSD - is no where near as efficient as a furminator.