I have an A-1 and I use anything almost but I love YLI. It has great colors and verigated colors and is made in the USA. There is 3000 yards on a cone instead of 2000 on King Tut and they look the same tex to me and run the same. YLI runs about $16 a cone and King Tut is $24. I also use ConnectingThreads cones and spools with great success. I also use serger thread if it's the right color and on charity quilts.