The verdict is in about the windshield ... at least for me.

Last night while I was in work, it rained pretty heavy and I had to use the wipers to initially clear the windshield. There was no skipping or chattering and the windshield was clean, no streaks or smears. Driving cleared the rest of the water off the glass and quite impressively of the paint - these larger beads of water really flew off the body panels.

After driving a few miles, the car and glass was completely dry and it was bright enough out to see the windshield, despite having used the wipers, was crystal clear. So any worries of smearing etc were not founded.

I figured that if the 303 Graphene coating, while at it's freshest and thickest didn't have any adverse affects from using the wipers, then as time goes by and the coating "fully" cures (I know, I know, no cure time required) and thins due to 'erosion' (for lack of a better term at the moment), then I don't see the smearing gremlin rearing it's head.