I bought the Janome 15000 last year. I'm still under warranty, and on my SECOND machine, getting ready to have my THIRD replacement. There is a SERIOUS problem with the bobbin system on this machine. First they blame the threading, then the thread, then the bobbin winding, etc. I have sewn for 64 years! I have used a Kenmore and a Pfaff all those years and NEVER had this issue, EVER, not ONCE. But, this machine just will not stop bird nesting under my sewing. I've changed threads, tensions, bobbins, needles, and speed. NOTHING works. This second one has been in the repair TWICE, and STILL bird nests. I've cried, pick out stitches, started over, etc. I believe it cannot be fixed as it is. The bobbin JUMPS up and rattles and then the bird nest happens. I think the problem is the removable bobbin case. All my other machines the bobbin case was permanent and fixed. But, these cases have to be removable to switch from regular sewing to embroidery. This is a design issue and it is NOT being addressed. IF this THIRD machine still does this, then I will ask for a refund. I've never been so disappointed in a machine, not to mention stressed and frustrated.