I have a regular Pilot Power on the front and a PP 2CT on the rear of my bike. I got 7,000 miles on the front without any squaring at all and on the rear I average around 4500 miles. I just got back from a 2600 mile road trip through the hot Southwest where we spent some significant time doing long stretches of straight highway riding. The rear would begin to square off a little after a few hundred miles of that type of riding but after some spirited twisty riding they would come back to round almost completely.
That being said, I've found the proper tire pressures are more critical on the Michelins than any other tire I've used. According to Michelin tire techs the Pilot Power work best at higher PSI than other Mfgs and recommend 37/38 PSI front and rear. I actually ran 40 psi rear and 38 front on this trip and they stuck like glue, gave great mpg mileage and worked well in 115º heat.
I'm not sure if you just do straight line commuting or not but if you do this probably isn't the tire for you.