I have an older 170, another great machine that is my piecing workhorse. I went to the Bernina machines because for some reason their feed dogs work such that you do not have to worry that your piece under the needle will "swing" at the end of the piece.
I had another premium machine brand when I started and I had to be very careful as at the end of any seam the feed dogs pulled the fabric sideways, which is a disaster in quilt piecing where accuracy is an issue. That was a machine more suited to wonky design! It was a lovely machine but for that one quirk.