I used mine today to overcast the edges of some upholstery fabric that I was given, that I am using to make a purse. I also use it to finish the cut edges of fabric before I wash the fabric. And I still sew clothing.
I would buy a used serger from a reliable store before I bought a cheap serger from a place like Walmart (not sure Walmart actually sells sergers). Tension adjustments can be difficult on sergers, and I would prefer a good machine backed by a reliable store.