Laser!
I can't really comment on the arm pit hair as I am getting it lasered off in conjunction with my face.
Body hair seemed to lessen, but again it's hard to say. My chest and abdomen hair thinned out and got lighter, but I am getting it lasered too.
Arm hair, I am trying to thin it out with a couple laser sessions, not enough to remove it, but to get it less "gorilla-ish".
Legs, slowly getting lasered. I am done with shaving. Been doing it for years, and am way too tired of it. I guess I am lazy.