I have a Sapphire 850, purchased it a year ago this July. STILL getting used to it. So far, I had a problem with FMQ the first time I tried it. But the second time worked just fine! Don't know what happened. The only complaint I have is I do not care for the way my bobbin winds. Sometimes they seem loosely wound. I am still learning several things with it and yes, I miss having the knee lift. But I quilted a queen sized quilt on it last week and it did extremely well! I was impressed.