I have a lot more than 12 dives on mine, but the pilling on mine is on the inside and it is not comfortable... rash guard helps. It has also gotten stretched out a bit(but that started right away)... fills with water too much so I look pretty funny when I get on the boat. Hopefully your suit will hold up!
Mine is not piling on the inside at all. Mine has stretched out a bit just so it's somewhat easier to get into. I have to "suck it in" when my buddy zips me up, so it fits pretty closely.