Both wife and 8 year old daughter say they are great. (Both have long hair) Wife apologized to daughter for thinking she was just a whiner all this time after trying daughter's brush which yanked hair, and then trying the Knot Genie which was more or less painless.  They both thanked me for getting them.  It hasn't been a long time so don't know if they will stand up, but initial impression is that this is a fantastic product and a great gift.