I have had mine for about 29 years, I was the first person in Australia and New Zealand to have one. ( J Pouch )
It is just playing up now in the last 4 months, a surgeon has told me that they now know stalpes were not a good thing to use because they may try to reject them. Great in bone but not in pouches. He told me things will not improve, he sending me to someone else for a second opinion.
The two surgeons that done the pioneer work 29 years ago came from the Mayo Clinic. I have been very happy upto now, I did not want a BAG !