I've used this brand of paper consistently over the past few years; have been very pleased with both the quality and the price. Have never had any trouble with it either in the printer or copier/fax machine.
… is I have no idea. I have no way of confirming the brightness and it does feel like 20lb paper so I have to assume the paper is as described. Reports printed look just like those printed on other paper Staples as well as other brands. Overall I have to say that I am satisfied with the paper.