I don't do reviews much at all but this is my 1st fleece roller mat. I got this in the other day(preorder). It works great. Fit in the sump(fiji 20 sump). I hated socks and I didn't want to mod a roller to fit this sump. Only thing I don't like so far is that I have to disconnect the sump from the tank to side the sump out to change the roller if need be. I have a complete fiji tank with stand and it's not tall enough just to slide the roller out to do any maintenance.