I've used one for about 14 years on our 16 footer. It worked real well until about 4 years ago when one of the wheels on the back came off when we were loading the boat. Note: sharp metal corners are not good for the bottom of a boat. After we had that replaced it has worked fine. The only disadvantage to them is the high number of moving parts which means lots of things can break. If you take care of it it should work fine (I hope).