I have the 7570 - I purchased the machine many years ago mainly for sewing & it sews great - no problems. I took lessons for the embrodery part - did a lot of embrodery. I think the newer models have a much bigger area to embrodery and you can change and "edit" your pattern. Also haven't checked in a long time to see if the Creative Cards are still available for the 7570.
I also have the Pfaff Grand Quilter - use it for quilting my quilts - only had it for a few months - but am very pleaseed with it.