I think this is a great idea. In monogamous relationships, so much pressure is put on the woman to be on birth control. Things can happen but now there can be more security since the man will be on birth control as well. If this method is safe and reliable, it would be a good idea for men to get on it.
There's an article on this which you can check out at: http://abcnews.go.com/Health/Sex/story?id=7500906&page=1