I have the Block RockIt and have had for a couple of years. It was the original machine, made by the Grace Company for Kathy Quilts. Grace then began selling them with their own name. I am very pleased with mine. It has a built in stitch regulator, a roughly 15 inch throat, M class bobbin, and needle up/down. I also have rear handles so I can (I'm trying to learn!) do pantographs from the back. That I have not mastered yet! I have never been sorry for purchasing this machine and it does everything I want it to do. What I would like to have now is the Launchpad frame made specifically for this machine--it wasn't available when I bought mine. Hopefully one of these days I'll be able to order it. Support is really great for either of these machines, which is a big plus for me. Help is only a phone call away.