I have the Block Rockit. Got one of the first ones that came out last year. Absolutely love it. The Block Rockit and the Q'nique are exactly the same machine other than the labeling. The Grace Company's engineers designed it for Lynn and Kathy with Kathy Quilts and then about six months later they labeled the same machine as the Q'nique for their company. Both Kathy Quilts and The Grace Company stand behind their machines 100%. On the Block Rockit if Lynn can't help us with a problem then the Grace Company helps us. We have a Block Rockit Yahoo Group that is pretty active and we help each other with our machines...we also include anyone with a Q'nique machine.
Don't know anything about the King Quilter.
David