I'm not surprised they say to use a circular motion. I'll bet they say to use terry to buff out, too.
A lot of these companies are behind on their marketing/documentation. The Meguiar's blurb on their microfiber towels ("Ultimate Wipes") says they're the first thing better than 100% Terry - and most of us here seem to agree on that fact. But the site "recipes" and recommendations still tell you to use terry. My Meguiar's Rep friend admitted this was wrong and should be changed - but also that it will probably be a while. Also, you can't find anything about some of their best and newest products on their web site, like the "Ultimate Bonnet", Scratch-X and Swirl Remover 2.0.