Need some info on a reversed vasectomy ?

My bf had a vasectomy two years ago and I need to know what the success rate is of getting pregnant after getting it reversed. I don't want to waste his time or mine, and if there is no chance of us getting pregnant within the next few years then I am going to seriously think about where this relationship can go. We have one daughter, who is my world, but I always dreamed of having two kids. He got it with out asking me after we got pregnant with our first daughter. Now he is regretting it and I am mad lol! Anyhow any info you can give me on how much it might cost in the US, how long it takes and the success rate of getting pregnant is appreciated!! Thanks!!