I think I am going to have to go invest in one to try today...My big flock runs out daily and if I didnt get to fill it late at roost and then got called to work they would be out of water for a few hours!! I am diligent on the late afternoon fill but it would be nice to not have to worry sooo much...
One of the things I liked was that you can just pull off the lid and "top it off" and clean as needed. can add a gallon or two wihout having to plug it up. and the crud should not flow back into the main resevoir. I'll let you know how it goes.
RobertH