Only had mine for a few months.. but so far no pitting and seems to be really good quality glass. Had a big rock kick up on the freeway a couple weeks ago hit it hard and there wasn't even so much as a mark.
Great glass - have had PPG on several cars over the last 20 or so years - ZERO problems. My current windshield (#3!) is PPG, and a huge improvement. Guess they also make the windscreens for our aircraft, no complaints there either!!
Ordered mine through Safelite and they installed it at my door for under $300. I definitely wouldn't use Safelite again though, they suck hard. When I had to replace my back glass, I used a local company who installed PPG and was MUCH happier with their customer service and actual knowledge on what they're doing.