I have a Q’ni On a Bernina frame in a room with hardwood floors for over 3 years. Due to the limited space I have to move it away from wall when I quilt and I don’t have any scratches or dents from it. I do agree that you have to check it’s lecel, but I just keep a small level in my sewing room and each time I pull it away from the wall I walk the length of the frame with it, no big deal. I think that’s because my sewing room seems to have the only level room in the house.