I have the 7550 which I bought probably 12-13 yrs ago and I have had no problems with it. I works really well for piecing and I have FMQ several items with it and have done up to queen size quilts. They are a little hard to manage but doable. New the machine was about $2400 Canadian so at that time around $2000 US. It is all electronic so if possible I would want to actually sew with the machine before buying it or have the seller give you some sort of guarantee that it still works properly. If something is wrong with the board on these machines they may still sew but the stitches could be all out of sync and therefore it would be difficult to get your stitch length etc to be what you want. Hope this helps and good luck.