I'm on my third serger and don't know what I'd do without it. I use it for all types of sewing. I double my binding and sew the edges before I attach it to the quilt. It keeps everything even and adds more body for longer wear.
Yes, I make bathingsuits. I taught Red Cross swimming for 45 years and I too couldn't afford the $80 and $90 suits which I needed cause I had to have a firmer bra support. I ended up making suits and giving classes for ladies with the same problem. I'm now in an aquatics class three times a week and still making my suits. Oh, and I'm 81 years experienced.