I haven't had issue with my five gallon mash tun cooler, but then I'm only on batch 4 of AG brewing, only brewing up to 5 gallons, and I'm not making rocket fuel. When the time comes to step up, I will. For now, it seems to be working just fine. It's a five gallon igloo water cooler converted to a mash tun with braided stainless hose and copper coil. When I get around to building the ten gallon, I'll probably use the false bottom method but might keep the braided mesh/copper coil setup as a backup.