The National Institute of Health takes a hard line that Vasectomy should be considered permanent. They report that about 1 in 6 men has had it, and is more likely in in proportion with education and income. It is the third most widely used method among married couples, after female sterilization and the pill. It is the single most often performed elective surgery. I did not know this.
Men widely report improved sex following vasectomy.
Some studies have shown a slight correlation with superior overall health. There are several conditions which do occur in one of every few thousand individuals. These include occassional swelling or tenderness, developing immune response to sperm, and standard post-operative infection risks. Be aware also that a man is still fertile for a week or two following the procedure. I feel chemical solutions are undesirable for women for several reasons.