I had mine done about 18 years ago: absolutely no problems, in and out in under an hour, no pain (I drove home afterwards), the scars healed within a couple of days. After a while (3 months? I don't remember now) I sent in a sample for testing and was told I still had about 5% sperm; repeated test (after 6 months?), got the all clear to discontinue other birth control methods.
Having said that, my jaw hit the floor when I walked in to the small operating theatre -- it turned out the surgeon was an old school friend I'd lost touch with! Funnily enough, I think I coped with the embarassment better than he did! So while he was fiddling with my balls we had a very pleasant time reminiscing over old times!
If anyone's thinking of getting snipped, personally, I'd unreservedly recommend it.