Using paper is wasteful and time consuming. Tearing it off is a pain and you need to shorten your stitch or it rips out the seam.
Since I found Quilt In A Days TRIANGLE square up ruler I can turn them out very quickly and they are always perfect.
Eleanor Burns is a genuis at finding the best and easiest ways to do quilting.
All my quilting buddies have switched once they saw how it worked.
Check out the ruler and her method at:
http://quiltinaday.com