I had it done about 7 years ago and there were complications. You'll get a pre-check a week or two before the operation. It was at my pre-check the doc noted I had a short vas deferens on one side, but said it should be ok. Should being the optimal word here. During the procedure the Doc wasn't able to fully grasp the vas deferens with the clamp to get a clean cut and cauterize the end. It kept slipping, and every time it did it felt like a linebacker kicked me square in the junk. This went on for an hour (two hours in at this point since the other side was done first) until he called in a second Doc who proceeded to attempt the maneuver for another hour with more slipping and what felt like the entire football team had lined up to kick me at this point. Unsuccessful he called in the head Doc who had it done in 15 minutes. I was very sore, like bags of peas every hour laying on the couch sore, for a couple of days. It took about three months for the pain to be completely gone. All that being said, i'm still glad I had it done for all the reasons everyone has posted already.