I used the Combi for awhile. It was a great improvement on the Yankee, but I was irritated by the constant leaking.
Awhile back I bought an old, used Yankee tank at a local photo store for $1.00, and have been using it without problems, although admittedly I am just now beginning to shoot and process more large format film. It loads fine for me, and as long as I don't get too violent with back and forth agitation, it is not too messy.
I am wondering what people do not like about the Yankee tank, and what I am missing by not investing in a combi tank?