Sounds good and I did buy. I didn't like the smell. I agree with the grid covering the bobbin cover--I like to watch how much thread I have left. I didn't see good instructions on aligning the lines with the needle position to get accuracy especially if I use the 1/4 inch foot. I had trouble getting a perfect line - not slightly crooked.
I rolled it up and put it in the container and decided I would try the Cluck Cluck Sew strips or just painter's tape.