I just got a new serger 2 weeks ago today & even though I've had sergers (4) for the last 25 years & there wasn't a thing wrong with mine I was getting frustrated having to re-thread needles & loopers when a thread broke. Then I found out that the Baby Lock Evolution was easier to work with. When a thread breaks, you only re-thread that one, it doesn't have to be threaded in a certain order. It's also very easy to change to another type of stitch. I love my Pfaff sewing machines & as long as I didn't know there was an easier to use serger, I loved my Pfaff 4872. I never dreamed I'd own anything other than a Pfaff, my CV & 2170 aren't going anywhere though.
If you're looking for a serger be sure to check out the Evolution.