This rating may seem a little harsh so let's explain. There is nothing particularly wrong with this shingle but it is just not that much better for all the hype and puffery IKO makes it to be. Like all Cambridge shingles it has a larger dimensional profile etc... There are some nice looking granule blends but they aren't blow your socks off or any actual higher definition "HD". 15 Year Iron Clad warranty is actually low for today's standards. They are OK but for the price you can get better shingles.