The decision has proved to be very practical. There is no need to change machine settings back and forth between cover stitch and regular overlock seam in the middle of any sewing project. Although I liked S21, it was lots of work that often interrupted the project. Sure, if you had planned the sewing order carefully beforehand, it would have been possible to sew a project from start to finish with a single change but in reality, things never went that way.
The Juki MCS1500 will feels very solid. The only thing to mention is the presser foot. The edges of the foot have height-sensing plates, which I like, and it is easy to guide fabric along them evenly. However, quiding a seam right in the middle of the foot is a bit difficult. I am looking after a foot that has some sort of guiding plate in the middle of the foot which would help to get seams precisely in the center of left and right needles.