Hello AJ:
Here is my "beginners" comparison between the Mach 3 and the Body Razor. I too have been a life-long Mach 3 user for my face.
I just now took my evening shower and shaved my head.
I used, (for the first time), five drops of "Shave Secret" oil with a small amount of "Foamy" shave cream.
I started shaving one side of my head from the top center line down with the Mach 3, (a brand new blade). Then I switched over to the Body Razor (not a new blade) for the other side.
No question about it, the Body Razor was easier to use. The shape of the thing and its flexibility make it much easier to get all of the curves on my skull.
And can you believe it - I am shaving my own head - and even comparing razors?!? What has happened to me? Oh, yeah; the Grape Kool Aid..................!