I see a lot of people going "I won't tamper with my balls!" here, but personally I think its better for men. Some women have great, great problems with mood swings etc, due to taking the hormones contained in contraceptive pills, and I for one would be happy to alleviate the problems if possible. Sure condoms work too but for spontaneous sex and for better feel I'd prefer a contraceptive that does not turn my GF into an emotionally unstable wreck. Also, I think its a good thing that there will be a option for men, It's about equality as well. You can talk it over with your partner and find which solution you prefer, but at least there won't be a way for scaredy-cat men to go "I'd totally do it if there were an option" and lie.
The risk I'm foreseeing is the one night stands where the guy promises that he's "absolutely on the pill. Took one before coming here!", leaving the girl with some bad consequences (especially in America where the anti abortion topic is so hot right now)