I have only tried a JR one time... it wasn't fabrics I was in love with, but it was on clearance so it wasn't a costly experiment. I enjoyed it, and like how it turned out, but I admit that I added strips cut from fabrics in my stash. Why did I add fabrics? because there just wasn't enough contrast in the strips as packaged. That's what keeps me from buying more. Mostly they are gorgeous fabrics, but just a little blah. So my perfect JR would have accurate 2 1/2 cuts and plenty of contrast in the fabrics.