Missmommy and I both have HQ 16s, the kind that are on a frame. The quilt is on the frame and the machine has handles so we're "driving" the machine. . . like long arm quilting but it's a shorter arm so it's called mid-arm quilting. I think it's well made, works well, and has been trouble free. There is more tension adjusting needed when quilting than there is when sewing on a sewing machine, but the adjusting is easy enough. I need more experience so my driving gets better!
I'm thinking that what you looked at is a sit down machine, where the machine is stationary and you're moving the quilt - - free arm quilting. If you haven't done free arm quilting you'll be like me where you'll need to practice - just that you'll be driving your quilt instead of driving the machine.
I've been frustrated a little because the dealer is a distance away and she's not very good at quilting so I don't get much help. It would be great if you have a knowledgable dealer conveniently located!