I have the Wave Master Pro and I really like it. There are many who claim it is tough on pumps to turn them on and off like that. I noticed that a few of my pumps made a bad buzzing noise on startup and that was annoying, but not the machines fault. It just depends on what your pumps sound like when they turn on wether it will bother you or not. I might have mine for sale soon, as I understand Seios are the worst for startup noise, and I am going to be running 4 seios in my new tank. If I decide I don't like the noise I will be selling the wave maker.