What is your opinion on the FORTIS control trainer for incontinence?

From what I can see from looking at it, it's no different that squeezing a rubber ball? During Pelvic PT one of the things they have me do is squeeze a ball about size of volley ball and hold it while doing kegels and abdominal breathing. They really stress breathing in abdominal, pull air in and start letting air out while doing holding a kegel. Then after you do that they have you do 2 abdominal breaths while doing kegel. Then they have me doing it sitting and standing. Also, have rubber strap that while sitting, you pull the rubber strap apart, stretch is out while doing kegels. That is just a few of many exercises. Anyway, point I think is I don't see much different that that device and a soft ball or they say I can use a firm pillow. The whole point is they want me pushing in with my legs while sitting and do kegels.