Our favorite shingle to offer is Malarkey Vista as its the only Class IV hail rated shingle in the laminate architectural offering in the Arizona valley. Underwriters Laboratories (UL) a third party, determines the impact resistance ratings for shingles across all manufactures and lines of shingles. There's nothing inherently wrong with the class III other contractors are offering. However, nearly every monsoon season hail effects some part of the valley. If you have Class IV no only will your roof be more resilient to hail but your homeowners insurance may even offer you a discount on your annual premiums as your roof is tougher and less likely going to sustain damage in such a storm. Talk to your insurance agents about potential discounts using class IV shingles. If we were putting shingles on our own home we would use Malarkey today!