I love it and have had no problems. Have watched this video which gives a good overview of it?
https://www.youtube.com/watch?v=uNHBEUtkUkI
You might still be able to pick up a QE4.0 for less than half the cost of the 4.2 which doesn't have enough new features to warrant the extra cost.
http://www.sewingmachinesplus.com/Pf...xpression4.php