I use it a lot. It is handy to get the specialty feet to go with it - especially the cording foot, as you can do cording and zippers very easily.Nancy Zieman has tons of videos on how to use the serger to your advantage. I have had other overlockers in the past, but my present one is fabulous as it has air - threading and is a Baby Lock.
Kaye Wood has a method of using an overlocker to make a 6 hour quilt (I think that's what she calls it). She sandwiches everything at the one time.