I’ve been using the small version of this filter on my 40 breeder for a year now. Took a little bit of fiddling to get set properly into my sump, but nothing too difficult or involved. Just some thinking and planning on how to use one of these, (never used one before), and some minor adjustments in the sump in order to get best performance out of it.
I’m happy with it, it does what it’s supposed to. I’ve ordered filter roller media from Steve at
https://preconfilter.com/
I sent him a sample/swath of the Bubble magus media and he found a similar replacement media at a much better price.
All in all, I like this thing and havent had any issues with it.