Definitely agree, they are the "bees knees" :-) . love mine for piecing, the idt works wonderfully at keeping the fabrics feeding evenly and is so easy to use.
I used mine to add belt loops to my motorcycle jeans. Waistband, Kevlar lining and denim belt loops. I really wasn't sure that it would work but i sewed slowly and the machine just stitched them on. I used my performance 5.0.