I had the same experience as Weezy Rider with Kona black. Cut sashing strips from it with my Go! and the ravelling at the edges was extreme. Decided to switch to Michael Miller black after that. I don't know about other Kona solid colors, as I was a little leery of trying them after my experience with the black. I have used Kona premium muslin with no problems, but the weave is not the same as the meatier solids.