I have a Gemsy midsize (10" throat) It's a generic of the Juki....I love, love, love this machine and it's much cheaper than a Juki. I got mine used..a drapery/upholstery person bought it new yrs ago and traded it in for a new one and then I came along drooling for a Juki. This looks just like a Juki, and works like a Juki. I got it at my little hole in the wall sewing machine repairman's shop and never looked back. It's wonderful. The sewing machine dude reconfigured it for just quilting and wouldn't let me take it home till I learned to use it. It can go about 98 MPH if I let it....had to learn to slow it down. It doesn't go on a frame. It has it's own table with a huge motor underneath plus (get this) an OIL PAN. It has a huge foot pedal (about the size of a treadle) and knee lift. You will see either these or Jukis at dry cleaners...it's their machine of choice.
Good luck in your hunt. I'm sure you'll find just the perfect one for you.