I have the Bodygroom. I would NOT suggest using it for intimate areas unless you are very careful of loose skin. The blades are open and can pinch/cut you if skin gets in there. This is versus other intimate shavers that are not as open. I have cut myself with the Bodygroom. And I have never used it in the shower.
So this is what I use and suggest...
Seiko Shavy Femini - This has a recessed rotating blade. Thus, it will not cut you. It is powerful and very nimble. You can do all your designs and such but it is good enough to cut through some big stripes.
Seiko Cleancut - This is a nice shaver for the intimate areas. It will not cut the hair down like a razor will, but it cuts it down so the skin is smooth, but not far enough to get ingrown hairs.
Phillips Bodygroom - Like I said, the blades are not recessed so they will knick your skin. The foil does a pretty good job too. This is an item to shave backs, chests or other wide open areas, IMHO. It does a good job at trimming down hairs, but isn't nimble like the Femini to get intimate areas properly.
My normal routine for intimate areas is to use the Bodygroom with an attachment (#1 normally) to cut all the hairs down. Then, use the Femini to sculpt. Then the cleancut for the final cut. I've used this method on my ex-girlfriend as well, so it works well on men and women. If you are just cutting back/chest hair, then I can't comment really, but it seems that the Bodygroom is what you want.
PS - I've tried many different methods of trimming and I've found this one to be the best and most comfortable.