I bought a serger when I used to do machine knitting. I had the idea of knitting a continuous length of fabric then use a sewing pattern, cut out the pieces then use the serger to construct the garment. It wasn’t a success but I think that was down to my inexperience.
I did find it useful when I wanted to alter some shop-bought clothing items when I managed to shed some weight.
Don't think I would like to use it when quilting though.