>I have had a few of the B11's and they havn't been very reliable for me 2 of them just won't work after only running a few times not to mention they aren't strong enough to pump from under the cabinet.<
They are not the highest quality pump, but I've found if you get one that's working well, usually it will work properly even years later. IMO it's not a really good idea to have a pump like this under your cabinet. If a siphon starts it could MT your tank. I hang mine on the back of my tank. They have no problem pumping though 30" of water and into an airstone.