Here you go Peter. The AUS has been in use since the 70's and, supposedly is the go to. Downside is that if you had radiation like me it may cause urethral erosion, is not pressure adjustable and, it is considered major surgery. The ProAct has only been in use since 2017, uses a balloon on each side of the urethra and, is minimally invasive as it is placed under the skin and, there is no incision (don't understand how that could be) and, can be adjusted in doctor's office using an adjustment port. Since I'm new to group it won't let me post link ?? you can search Uromedica.com/proact.