This pump is everything they say it is. Very easy to disassemble and clean. Be very careful with the impeller and the ceramic shaft. Very quiet. Cons are heats the water when used in two gallons or less, suction cup comes loose under water to easily. Over all I give it high marks. It will last for years if you don't break the ceramic shaft.
This works perfectly for Fluval Spec 16, upgrade to stock pump with over twice the water turn over. Pushing a lot more through chamber 1 & 2. Highly recommend this pump as a replacement or an upgrade. One thing to note is you will need an adaptor between the new pump and the Fluval Spec tubing.
From my first purchase of Aqua Top I always look first to this brand. Quality and dependable.
There is lower priced items from others but this brand delivers best performance over all so far.