Which one did you buy John, or did yours already on the bike. One is $30 and the other $49 or so. The latter looks to be a better quality but it is difficult to tell from pictures.
I don't think all the male Beemer riders still have nads but some do I suppose. Thus, you won't have to go through any surgical process.
I did buy it, and have it. Not yet installed it but would say that based upon intiitial inspection it will work fine. Seems well made for the price. Here is the one I actually got. Two fobs.