As with machines, I'd go around and try a few first. What is good for one maybe more scary for others. There are some that I've heard that are self threading but I've also heard those can be tricky. Most once a machine has been threaded right try to avoid unthreading them. Instead they tie the new thread to the already threaded thread and pull it thru. My next purchase will be a new serger but I will try several out. I have one that is over 20yrs old and its been close to that since it's been used; alot had changed since then. Nancy Zieman has videos on them and she has a book about quilting with them. I know some searge the fabric before washing.