I have the 12000 which had one previous owner, 70+ yr old used it once and returned it to the dealer as she found it too complicated. I'm not particularly tech minded but I've sussed the machine out though of course there's heaps I haven't had any need to use. When I got this one from the dealer he said the most notable distinction between the two machines was the ability to use wifi for iPad. That would definitely be a boost since no trailing wires to contend with. I guess also part of your decision has to be whether you want a separate embroidery machine as it can be a bit frustrating waiting for embroidery to be completed when you would like to get on with something else. I'd've been tempted by the 15000 but with £1000 off I just felt I couldn't turn down the opportunity to own this one. Good luck in your choice I'm sure you won't regret it.