I use Staples Brand of copier paper all the time. It's economical and does the job that I need it to do. I am secretary and graphic artist for a historical community band and go through many reams of paper in the course of a year so the product needs to be able to stand up to the rigors I put it though. Its bright color makes my posters "pop out" and is sturdy enough to be easy to work with. One problem I've always had with inferior brands is that they get caught in the copier causing it to jam up wasting more paper than I care to! Staples Copy Paper has outperformed those other brands hands down. I also use a lot of paper to copy music (obviously!). My Band plays the bulk of its concerts in the summer time outside. It's very important with humid weather that the paper the music is printed on won't curl up and wilt which is a distressing problem for any musician - but especially to a soloist who is out in front of a crowd! Staples performs as well as the Band in this regard.
I have been buying this paper for my printer for years - its terrific quality at an affordable price. But lately I have not been happy with the packaging because it ripped and/or became unsealed in the delivery process causing some of the paper pieces getting damaged.