I had the biofeedback done about a year after surgery. At this time, I was using about 3 pads/day.
It's a little embarrassing given that they put a couple of sensors very close to your anus, but it does tell you what you want to know about doing kegels properly.It is really a training session, which in my case covered about 6 visits.
Unfortunately, Kegels didn't do much to improve my situation even after training.
I finally ended up getting the AdVance Male Sling, which now has me totally dry. (See my previous posts)
Ed