I have a tin lizzie 18ls that I use the Qbot with. So much easier to stitch designs precisely, and back-tracking - very difficult to do free hand I find. If it's just for your own quilting it's great, however, I wish I had bought better, like the Inteliquilter. More expensive, but does a lot more.
You will also probably need a computer program, to digitise designs and convert any you buy to the qbot format, I haven't used many of the ones that came with it. Have purchased some, but they have to be 'tweaked' to suit.
If I can help more feel free to pm me
Good luck