Well, OK technically they were designed for men's facial hair. that does not mean they won't work and even do a good job on hair in other places.
Actually, for most of us men on this forum, male facial hair is probably the most difficult to use an electric shaver on. It's coarse, it's dense (a lot of it close together in one area) and grows in different directions. And if an electric does a reasonably good job on male facial hair, there is no reason to think why it can't work well on other areas too.
My vote is for the Synchro, for ANY tupe of hair. But different people will often prefer different shavers, just as they would different blades. There is an electric shaver shop near where I live and they say that the Synchro is the most popular electric by far and it is the most reliable.
RJC2001