Sergers are GREAT machines....unfortunately most of us who have them truly do not use them to their potential. Reason, In my opinion.....threading! Lol! My recommendation is when looking at sergers make threading them one of the things you do before you purchase. Make sure you are comfortable with threading or you feel it is relatively easy.
I tend to use mine if I am making a lot of something....1,000 dog booties for an ididadrod dog sled team, 30 coin purses for a baby shower, decorative edging on cloth napkins......etc. BUT.... My goal this year is to do some decorative serging on scarfs, flags etc. I am referencing Nancys Notions, you tube Etc. for serger projects