the Honeywells i found are pretty intuitive, for a FMS. you get the knack of most of it pretty quickly. and the scratchpad is a wonderful thing.

now the universals, yeah... these things were designed by engineers, for engineers. they will do more than the Honeywells, but you have to know exactly what you want, and how to find said function. they were a total pain in the a$$ to use. i'm glad the 170 has the newer Honeywell (lifted from the G-V) that isn't quite as predisposed to doing the "Embraer clearing turns" as the 145 is.

can't track a VOR in green needles, but otherwise very nice.