I've used them in several t-shirt quilts--I prefer ShapeFlex fusible, a woven lightweight fusible that I can buy at the LQS in 54" width (although you can find at JoAnn's in 20-24" widths). I did not use a ballpoint needle due to the fusible. I did slow down when quilting on the long arm out of concern of snagging those soccer shirts. But did not have problems at all. Definitely use a damp pressing cloth when fusing as there is a lot of poly in those knits. Biggest problem for me was that they were harder to cut due to slipperiness.