for the price you cant go wrong! i have a couple, one did quit working after about six months of use, but i could fix it. the down side for me is the size. they add about 4" of length to the powerhead. they also will reduce the out put quite a bit. but for the less than $15 price they work great. they will chop up the water flow, witch corals love. is there better products out there? yes, but not for those like myself that are budget limited.