Neat little foot, thinking fabric designs for small items like purses, baby clothes, etc. Might be handy for curtains, shower curtains too. Great video on you tube
http://www.youtube.com/watch?v=PI9E8JBUj_0
I have the Brother circle sewing attachment for larger circles, but that was $99 4 years ago and this little foot pops on and off fairly easy from the looks of it.
Thanks for sharing.