Good pump for the money. I have 2 #4 pumps running in my 75 for over a week now. Lots of even, multidirectional flow. Magnets seem strong but if the pump ever disengages from the magnet there will be hell to pay in the tank as the motor is on the inside. Set up was easy & if you shop around you can get a deal. Swivel is a good feature. Flow rate is not adjustable. Overall they are quiet but I have them on a wave timer & they are noisy on startup. Pumps have a large footprint in the tank which might be a concern for some. Large exposed opening in the front - if a snail hits it I don't know if it would stop & burn out?? Hope not.