Great Pumps, very dependable. The Diaphragms last more then a year, if left running 24/7. Easy replacement diaphragm Kits are available for little cost, around 10 bucks, and pretty easy to install, with just a screw driver, and a pair of pliers. Oscillating diaphragm motors probably could last forever, if you change out the diaphragms, before the completely ware-out. I had some of these pumps last upwards to 3 plus years without ever doing anything to them. Well worth the money. As for the other review, their aren't any adjustments for the airflow, but that can be easily modified with a simple air valve.
Reviewed by: Max from California on 10/23/2012