Hi and welcome. I have a Carbomedics mitral valve, which I was told recently by someone on the boards is in between a St. Judes and an OnX. From what I have been reading here recently, OnX is the newest and also has some kind of material that is supposed to help reduce the risk of clots. (anyone, correct me if I am not explaining this correctly) When I received my valve, I was not informed enough about making a choice and my surgeon chose. I'm glad I received the Carbomedics as I am very active and it is working well for me, but if I had to choose today would probably choose the OnX. I can hear the ticking but not all the time, but I know you can with the others as well. I wouldn't have believed it in the beginning, but you do get used to it; it doesn't bother me. I don't believe the type of valve affects recovery time and it seems that we all recover at different paces, regardless of valve type. And of course, with a mechanical valve, you will have to be on coumadin/warfarin, which is nothing to be afraid of, if you do in fact have to have the replacement. I am sure there will be others along shortly to give their advice as well. Good luck on Monday.