These are AWESOME! The razor inside makes life so easy, and comfortable for the horse. I went through the same dilemma with my mare, who had a long mane. We had it shortened in about two sessions. Now I just hand pull it in small increments after workouts. The Main Comb Mane Thinning Comb and Long Handle
We have a similar, less flashy version at our local tack store for around $3.50.