I am running the Schuran Multifilter, and it is by far the best I have used. It is built like a brick "poop" house, and holds close to 6 cups of media. I really do not like the
BRS. I have the deluxe model, and I don't like how little media it holds compared to my Schuran, and, at least in my system, it clogged up noticeably in about 3 days. A real PITA for me to be opening it up every 3-5 days to rinse the sponges. My Schuran has sponges, too, but they are less dense. I'm guessing part of it could be that I dose kalk, which tends to clog sponges, filter socks, etc, but I never have a problem with the Schuran. is it expensive and hard to find? Heck yeah, but the little to no maintenance, to me, makes it worth every penny. I like that it is an "in-sump" unit, too.
I have used the PhosBan reactor in the past, and while I had no trouble with it's functionality, I didn't like that it had to hang off the sump.
Here's a not so good picture of it...