There is an excellent youtube video on the Pfaff Quilt Expression 4.2 machine made by
http://www.villagesewing.com.
It is 1 hr. 19 minutes long and covers everything about the machine. I highly recommend you watch it. I've seen it 2 times and return to if when I have a question. I have even called the store and spoken with John, the man in the video. He is very nice and loves talking about the Pfaff 4.2.