yes I have one, spent ages padding it to my actual size and made a cover for it. A few months ago I took the padding and cover off after I lost weight and they are stored in a cupboard. Hand on heart, I never used it for any kind of fitting. Now it stands in my sewing room as a convenient place to hang a work in progress. Tbh it is convenient, a good place to leave a dress to drop lower
I cut pippi out, having already altered the pattern, grading from smaller bust to larger waist and hips. Then I decided to do a burn test as I dont wear polyester. Fortunately over a sink of cold water. The flame shot up and the fabric curled back on itself before I could drop it and burning sticky black tar stuck tothe underside of one finger. I managed to eventually rub that off under water. Dashed to my first aid kit to get the reliburn, which should soon take the heat out of the skin
So no careful sewing on that rubbish fabric, just quick big stitches to see if my grading worked. That stuff burnt so fast, I think it may have been a blend of poly and acetate. It was lethal