I've been using the Staples brand copy paper for some time now and have been happy with the quality which is as good or better than the name brands. I took advantage of the automatic rebate and purchased a case making the cost per ream less than half the cost of purchasing them individually.
I was slightly disappointed that I could get only 8 reams in the case rather than the usual 10. But the quality of the paper is fine and not having to go out to buy the paper was fine too.