I use this paper everyday at work in our copier/printer/fax. It is very good quality. I have tried the name brand paper and there is no difference so why spend the difference??
I make multiple copies during a work day. Mostly for my own use printing info off computer during business calls. Most get filed or thrown out. For this it is perfect as cost is low. I would use for a casual letter but not for something important such as a formal business letter. Only problem I have had is it jamming my printer by having more than one page pull through at a time. But this is not a constant but a random occurance. Rarely happens with more expensive paper.
Staples copy paper helps us get through our day for copies. We use Staples paper for memos print out of emails make a hurried copy of out-going mail. The greatest feature is that it is affordable especially for non-profit organizations.