Am not familiar with them myself - but then Atlas has pretty much disappeared in our area due to all the defect claims against them for absorbing water and blistering, cracking, losing aggregate, blowback, nailing line being the wrong place on the shingles so they peel back in big sheets in the wind, etc so that is a brand I would never use anyway - many people like me feel they are about at the bottom of the choices as far as thickness, stiffness, and price.
I would google for info on lawsuits and claims on Atlas shingles - there have been and are a ton of them out there.
You can find a number of previous questions about shingle brands/models in the Home > Roofing link under Browse Projects. And note that almost any manufacturer will have product lines from cheapo to their top-of-line, and just like windows and doors quality can range from terrible to pretty good for the same manufacturer. In reality, it is hard to find a top-notch shingle these days because they are all in a race for the cheapest and lightest weight, so consider going with a heavier shingle than the minimum allowed for your area - I would recommend nothing liughter than about 250#/square, and of course if high winds, hail, significant snow coverage in the winter, etc are expected in your area you might consider going with a shingle designed for those conditions even if not required in your area. Commonly, you are talking a thousand or so difference between cheapo and the top-of-line shingles, on a typically $5,000-10,000 job, so probably the easiest way (other than by being sure you get a real good reputation roofer) to get longer life out of your roof is to go with a heavier weight, top-of-line shingle.