Hello... Is it worth buying a "Used" Window Regulator? I found a shop selling used parts for the same year as my car, 1998 528i. They are selling the rear regulator w/motor for $100 plus $75 install. The thing that concerns me is that these things were prone to break right? And who knows how much life that used regulator has. There is no warranty just straight up purchase. What do you all recommend?