Well, I'm hoping it has good long term results. My surgeon told me though, that because of my "young" age (I just love that) of 45, I would hopefully get somewhere between 10-12 years out of it. He had some who had gone longer and only 2 I think who had come back in like 5-7 years. Again, these were all people under 60 in which tissue valves don't have as long of a life. I'm shooting for 20 out of mine...LOL
Kim