I just got ClearPlex installed two days ago. Look it up - http://www.clearplex.com/
... I'm very satisfied..
I had the same issue you did. A big rock chip and hundreds of small pits on my original windshield. I finally got sick of that, got my windshield replaced and then slapped on some ClearPlex ... and it looks great. Hopefully I won't get the pits and will keep the rocks from damaging my windshield as much as they did before..