I had aggressive prostate cancer that spread to my bladder neck. The surgeon removed the lower part of my bladder which decreased my bladder capacity and led to OAB, bladder spasms that caused leakage, and chronic pain. The Interstim trial successfully eliminated my spasms and some of the urgency, so I went ahead with the permanent implant. That was 1 year ago and I'm able to keep the setting on a very low .3, never feel it tingling, and I still don't have any spasms. It didn't help with the pain unfortunately, and I can feel the battery and one of the wires under my skin, but it doesn't cause any problems. Overall I'm glad I did it. The surgery itself wasn't bad, but I was pretty sore for a couple of weeks. I'd say if you were happy with the results of the trial you'll be happy with the results of the permanent implant. Hopefully this helps.