The original handi quilter frame/platform for your domestic sewing machine. I got it as a Christmas present - because I asked for it. I used it a few times. But I make large bed quilts (queen or king). Even with a Juki TL98E (9 inch throat) by the time you pass half way the quilt, you have very limited space to actually quilt - because the rest of the quilt is in a rigid roll in the throat of the machine.
Now I mostly rent time on a longarm. Or if I have to, I FMQ on my Juki in my quilting table. At least then I can 'scrunch' the fabric and quilt from the middle out - so I never have more than half the quilt in the throat of the machine at a time.