I bought one for my Biocube 14g but both are sitting new in the box waiting with four other empty tanks, but in my research prior to purchase there were not very many positive reviews.
I also debated buying one but peoples reviews here and other places kinda led me to think I'd be better off with just more pwc's to keep the tank stable. It just doesnt seem worth the money in my opinion.
__________________ 180g- Mostly BIG fish and some coral. ~80g Nuvo- My coral tank with "happy fish"~ 90g- FOWLR Not the not happy type of fish~ 125g- Freshwater Malawi Cichlids ~10g- Nuvo- The refugees from the Ich of '18