bottom/top feeds have the same potential issue of flooding. not a big deal to fix, but can be inconvenient. with the feedimus and the reo grand, i've learned how much touch it takes to feed properly, dependent on bottle volume. and these work excellent as stated above.
but if you're looking for easiest, fill and go method, you can't beat tank-type feeds imo. the afs/avs, bulli a1/a2, the new map tank, and others. no buttons to press.