I couldn't tell the difference yet from the old shocks. I just replaced it saturday and haven't driven it much. Not sure also if it's the updated oem. It has mercedes insigna all over it. I had help from a mechanic friend of mine. We did it in his garage. It was about a 5 hour job. It cost me $600 for the 2 rear shocks, four pair of brake pads, resurfacing of the rotors and a lunch. My brakes are squealin also so we replaced them while we're at it. The shocks and the spring came together as one piece. We just used his flat jacks for the spring tension. It was a learning experience for me especially the brake pads since MLs eats them a lot. Next time I could do them myself.