Check out reviews on patternreview.com. The CV 5.0 did have a lot of troubles, the upgrade to 5.5 was supposedly better. If you can avoid trading in your 7570, then keep it. It's said to be the best of the German-made Pfaffs, maybe best ever. Whatever you do, test-drive it very throroughly on your own samples (incl own thread, needles, tasks) and be sure you trust the dealer for such a huge purchase. Good luck!