I purchased 4 Zoo Med powersweeps about 4 or 5 years ago. While the idea is nice, the product is junk. In only a couple of months the sweep feature quit working. If I cleaned that part of the power head it would work for only a few days.
Then after about 6 months the motors went on me. Today I don't use them, and they have gone to "the great aquarium in the sky". In other words, I threw them out.
Save your money and get something excecellent.
If money is no object the Tunze Stream pumps running on their mulitcontroller are excellent. They are also extremely expensive.