I took a hand quilting class at my LQS and they suggested Kona as muslin since some muslins are too rough and difficult to hand quilt. I found it to be very nice and good quilting cotton quality. I love the knowledge of my LQS staff and pay a little more up front. Of course, once I get comfortable with my knowledge I go off and hit the deals, LOL!
Thanks to all of you for your vast knowledge, you've helped me save a ton of $, which I go out and spend on more stash !!!