The vasectomy reversal is by no means as reliable as the vasectomy. Even a successful reversal can reverse itself again fairly quickly through tube scarring etc. This happened to me. I believe there are only a small percentage of long term reverses.
Note that your wigglers go into your body after a vasectomy so your body develops anti-bodies to your sperm as well. There is a school of thought that this could reduce your sex drive.
I am happy that I have the IOFB tie, but when I got my vasectomy done I was told it was symptom free and "so much better than your wife getting her tubes tied"... I'm not as sure as I was then.