I have one and am kind of neutral about it. I now have it on a 240 along with a sump. I am not even sure if it is doing me much good, I had it so I use it. I only have the sponges and trays of ceramic so it isn't getting clogged. I have about 5 ft head, so I don't think my flow is all that great. When I have my hand in front of the output hose it isn't that great. My fish certainly don't hang in the output flow like my 2 sump returns or powerheads for entertainment.
I don't know that I would own one if I hadn't gotten it so cheap used on CL, $120 loaded. There is several threads on here about how to modify them to do more which makes me think there are a number of people that think it isn't as good as it should / could be.