I had 2 of the Seio 1100s and they were nice, cheap pumps. I didn't use it on a wavemaker, so they were turned on and left on. The only complaint that I have about them is that when I turned them off for cleaning, it'd have tap the prop with a straw to get it to start up again. These are inexpensive alternatives to other pumps on the market, but you get what you pay for. I was happy with these, but then the Hydor came, so I tried them out and these are going to be replacing the Seios.
I thought about Tunzes, but I couldn't justify spending that much.