I think first aid is way better. Also there is a kaplan version too, that is usually at Barnes and Noble (you can just go and glance through it quickly). It has some good stuff in it.
I got first aid & it seems to be pretty good. I take my test on Thursday, so I'll try to let everyone know.
From what other people have told me, first aid is a good resource, but overall it is easy. Just another day in the clinic, but I can't help being a little more paranoid for a stupid, f$cki#g test that is $1000 plus travel