Years ago I purchased a 5 spool Singer serger, top of the line in its day. It came all threaded with white thread but I wanted to make a jumper out of black denim. So I rethreaded with black thread. Would not sew properly. So I rethreaded with white thread. Still sewed improperly. Went back to black. No go. Curious about which spool was causing the problem I rethreaded it in five different colors so I could get a visual on which thread was not threaded right. Thing sewed the most beautiful rainbow colored seam. Dang. So, I sewed the jumper with rainbow seams and then gave the machine to my best friend. I did not need that hassle. Now, if I take a hankering to have anything serged (background squares of fabric for hand applique usually) she does it for me. That's just my story but I say if you want one, get one. You may love serging.