Actually had a claim against a Certainteed premium Landmark shingle that refused to lay down smoothly on one slope.
I personally felt the decision should have been put off another 6O days to allow the Texas Sun to flatten the slope completely.
The MFG rep paid to deliver more shingles and replace the 30sq. slope.
I cannot complain a bit about how the situation was handled. My first warranty experience was settled professionally and equitably for my customer and my company. A little more specific run data from the machine status at the time of manufacture would have been eye opening I suspect.