Love my 2 Pfaffs 7570 and 2140.

Qe4 and the little lip in front of the bobbin that turns are seam edges. Placing a 3/4 inch wide piece of masking tape over that lip allows the seams to glide right over without turning. I'd been battling that and read the tip somewhere about a month ago but never tried until reading about the problem in this thread today - it does work. I wouldn't use any kind of tape that is really sticky. Mine is the paper masking tape you use for painting and it comes off very easily. I'm stopping for the night and removed it just in case as I don't want any residue build up if I can avoid it. Just thought I'd share.

Thank you for starting this thread. I've bookmarked and have enjoyed reading it and learning which is a good thing.

I have a QE4 and absolutely love it. I use it all the time for quilting and sewing. I have had absolutely no problems with it. It takes a bit of getting used to not needing to lower the presser foot, but that only takes a few times of using it. I highly recommend it.
Lil from Spokane Washington :)

My first machine was a pfaff 6122 and i loved it. Great to learn on. I just made a mistake 2 yrs ago and bought a janome 8900 horizon and have not like it. We now have a pfaff dealer in our area and am looking at a pfaff qe 4.2. The thing that scares me is they don't have a presser foot lift handle in back of presser foot. The presser foot on this machine is automatic lift and that is good in some applications but in piecing i use hands and foot to get material exactly placed for the 1/4" seem. With the automatic you can't get presser foot low enough to make sure it is where you want it on the material. I've never used the electronic knee lift and maybe that works in place of the physical handle. Has anyone had any experience on this machine??? Thank you.