I use mine whenever I'm FMQ-ing. I don't find that it's a big deal when changing bobbins since I have to move everything anyway. I just kind of roll it back out of the way. I also have to remove the sewing table insert so that's just how my quilting goes
I think it does help take the drag off the quilt. And yes I did sew it to my quilt a little at one point so now I use painters tape to hold it in place. After reading this though, I'll try cleaning it, maybe that's all it needed. I haven't found a need for the bobbin washers with my Pfaff, maybe because the bobbins are plastic. I do like the machinagers gloves better than the garden gloves I first tried. My hands don't sweat in them.