We have 4 dogs & I have always had a self water feeder & this one works the best. It’s easy to clean, fill and replace. We’ve had those that work more like the ones people use and those were heavy, hard to flip and replace the water without spilling. This one, once you fill, seal the cap, you simply lower into the dish & twist. It is a great design!.  I just wish though you’d make one larger than 2.5 gallons :-)
Great product & I highly recommend!