i am using step up and using FA as an "aid". looking up the systems as i go through step up. I like SU because it give more explainations. but few "flaws" 1) basic science part is weak--i am using HY with it. 2) for some of the dz, it doesn't tell exactly the treatment is. 3) i had to look up some of the histology and anatomy for path too. But i do like the fact that it's organ base so i can go through the system as sets and the story is more complete. Another thing that's good about it is the "quick hits" at the margin of SU. It correalates the secion you are looking at with something from another.. so keeps the whole story flows really well together.
anyway, i haven't taken my exam yet. so i don't know if what i am using is good enought for the boards. these are just a few things i feel about SU.
good luck