For me, i was and still am so afraid of the blade razor, always scared to cut my self deep with that.
So until now i was using a combination of hair trimmer and electric shaver, work ok but not really a super clean job.
After reading this post, i went to read in the link that killbill posted, in this one uncle bob speaks of a certain phillips body groomer.
I went to by it, Alleluya , i am soo glad to have found that. Not only its save for your balls, it also shave almost as clear as a blade. And it doesn't pull hairs, like some other shavers do.
It is just perfect for me anyways.