I've recently had a real nightmare with yli! I spent 4 hours sewing with it (and cursing at it!), then 12 hours ripping it out (I'd done about half of the background of my tardis quilt) because the skipped stitches were just horrible and it was breaking after about 30 seconds sewing! I had a quick try with gutterman and it worked like a dream! It took me one hour to quilt the entire background with the gutterman!
King tut is usually my go to thread for quilting (hand or machine) because my local fabric shop sells it (and not many other brands) but I was in a different shop and spotted the yli and thought it was worth a try. I couldn't have been more wrong! I love the selection of variegated threads they do!