I love my Pfaff, old style, not self threading. I made my own color threading chart. It is a 3-4 thread machine. It does the cover stitch and all.
A friend picked up one at a garage sale and also loves it.
Just try them out. Look for used as someone may have traded up for
Christmas.
Another friend bought an 8 thread serger and still wonders "why?" She has more financial resources than I do though.