I own a Pfaff total mechanical serger that I wouldn't trade for anything and it is pretty easy to thread. I bought it for garment sewing and have sewn the snot out of it. It is still hanging in there. I haven't felt the need for a coverlock and computerized sergers were not around when I purchased so it wasn't a consideration. I never felt the need to trade up for a different one. I may have to change my mind if/when parts become scarce.