I've used it and as mentioned earlier if it's a fairly loose pattern (large swirls, writing etc.) there's no problem with it coming out just fine, I did use it on a daisy type pattern & had a heck of a time getting all the tidbits out where the stitching met in the middle. I just use my free motion so there is no actual stitch length. The one great advantage is you just smooth it over your sandwiched block & no pins to stop & remove. However you do need to be sure to use a marker that will not transfer onto the fabric. Sometimes even a sharpie once dried will get onto the fabric & that's NOT FUN!