I have both a Yankee and a Combiplan. The Yankee is incredibly wasteful of chemistry, and it doesn't just leak, it drools chemistry all over your hands because the lid doesn't seal. The Combiplan is more chemistry-efficient, but a pain in the ass to load, and it also leaks, just not nearly as much as the Yankee. The problem with the way the Combiplan leaks is that since it leaks from the drain valve, and the volumes of chemistry are already low, it could leak enough to give you insufficient coverage of your film for the entire development/fixing cycles. After both of these, I switched to a Jobo Expert drum and haven't looked back. I was lucky and got mine when you could still buy them used for $100-150 each.