check what they mean by stitch reguator. I am not familiar with the newer ones but that price appears way under for a tru stitch regulator. I ask someone demonstrating such a device one time and was told the quilter regulated the stitch with the movement of hands according to the speed the motor was running.
The Bernina stitch regulator which interfaces with the mechanism of the machine cost big bucks. So be sure what you are getting. Also, I agree with the above posts, the space is limited and have to reposition frequently. Is it reall just a big hoop to keep the quilt flat. If you can.....then try it out first. Dont buy blindly.