There is no doubt there were problems with some Pfaffs for a while. My first 4.0 was a lemon and was exchanged three months after I bought it for a new one. We took a long time to bond, but since then I've grown to love it so much I bought the Performance 5 and keep the 4.0 at class. Apart from the auto pivot which I love, the 5 has 3 FMQ modes, although I mostly use the Sensormatic where it 'hovers' above the fabric. There's a great YouTube video on the 4.2. Happy quilting.