i am up in the air on it. it was a pain to assemble and is a bit of a challenge to re-floss when it runs out. I have a trigger fleece roller on my large tank, which is easier to use. I also, manually advance the roller daily (manually as in push the button)... I don't know if it just doesnt advance well on its own, of if I didnt setup the float correctly. I havent had time to chase that down. I still prefer it to filter socks so that is something,Tank looks great. How do you like the filter roller mat?