Hi - I am replacing my roof and purchased owens corning premium asphalt dimensional shingles (from lowes) - my contractor tells me they are bottom of the barrel - garbage - (elk, gaf and certainteed would be better for the same cost.) i don't know if that's just one man's opinion. i see mixed reviews on-line (the few i can find). home depot sells gaf so i thought they would be comparable to lowes owens corning. i don't really want to cancel my order if these will work just fine. any thoughts from other pros out there?