http://www.calicoheartquiltshop.com/...iewDoc&docId=2
This site may help in the discussion of fabric grades and why you can feel a difference in the fabrics at your favorite quilt shop.
I bought some of that "Kona" fabric at JoAnns and was disappointed when I got home. It's thinner than I thought it was (I bought the white) and I ended up using a sheet with a tighter weave that I had on hand. I may use it later on in another project but will be purchasing higher quality basic fabrics for the stash for sure.