I have that attachment, too and have only used it a couple of times - no problems with it, though. Remember you need to do a preliminary cut of about half inch to get the blade started. I have a serger but I am too lazy to load up 4 spools every time I want to serge. Thought about getting a gismo Nancy's Notions I think has that you can put on the back of the serger and just use bobbins. Otherwise I use the overcast. Just depends on my mood and how big an item it is.
Mary