Hi, I have owned a 1972 280SE 3.5 for about 2 years. It is a joy to drive especially with the 4 speed auto, power disc brakes and power steering. It had been looked after fairly well however I have replaced the front shocks (original) with bilsteins, the front suspension mounts, and the engine mounts. I also spent 2 days in the boot (trunk) cleaning and sanding it before having it repainted satin black, plus many other small replacements.
I am also going to replace the rear axle trailing arm rubbers front and back, in our winter down here.
My wife prefers riding in this to my 280SL, and our three grandkids love the backseat saying it is wider than the backseat in our Subaru grandwagon, although they couldn't figure out what the little "cupboards with chrome lids" in the back doors were for, they were aghast to find that people actually smoked in cars back in the day! They had also never seen window winders (regulators) before!
I know a guy who owned one of these back in the day then bought the next model 1973 280SE 4.5 with a 3 stage auto, brand new and still owns it. It is immaculate but he regrets going to a 4.5 L with a 3 stage auto saying it was a retrograde step