I nearly had it done a few years ago, as I have kids already. I went for the appointment, had the compulsory counselling before hand and had it booked. My father, who has had a vasectomy a few years ago, talked me out of it, saying that it 'wasn't the same' afterwards. I took his advice, as a young man in my early thirties.
Not something that i would ever consider well not at the moment anyway.