I have this machine, with an inspira frame and Qbot automated quilter. The Mega Quilter 18 X 8 was discontinued at least a year ago, and was replaced by the Platinum 3000. If it really is the older model, you should be able to get it for less than the price you listed.
The 18 X 8 is a Tin Lizzie 18LS. I really like mine a lot. It will sew with any thread, and it is very easy to set the tension. My only complaint is that the frame is a little stiff, but I'm comparing it with a friend's frame that cost LOTS more than the one I have, so I can live with it. It works great for most of my quilting, just can't seem to do micro work, which is fine.
On any purchase for this dollar amount, you really should try before you buy, so have them set it up for you.