I like the quality of this paint, we have used BM Regal Select in almost our entire house.
For this project, we used Simply White (walls in eggshell and ceiling using BM ultra flat ceiling paint), Revere Pewter (trim in semi-gloss and accent in eggshell) and Kendall Charcoal (accent in eggshell) in our basement, which has mostly south-facing windows. The colors work so well together both in the natural light (though it's not much) and recessed lighting. I spent so much time finding the right white that wasn't too beige or yellow or blue etc to match our lifeproof alys oak flooring, hope this review will be helpful to others.
Our painter mentioned that the Simply White came on a bit thin and had to do 2 coats (but we were painting over primed drywall, not painted already...and I was expecting two coats anyway). I painted some of the baseboards and noticed it was a bit more difficult (i.e. noticed roll marks more easily) than when I painted with SW Pale Oak in Satin for bathroom baseboards. I gave up and had the painter spray them, which turned out great.
Overall I'm so happy with the quality of the paint and how the colors work with each other in a darker environment. We are using copper accents to highlight our red oak stairs and bring the green out of the Revere Pewter, can't wait until it's finished!