These springs are great quality! I'm only giving it 4 stars because it is advertised that these springs lower 1.5", when in reality, it lowers a W201 with a 2.6L 6 cyl somewhere between 2.5-3". The car still rides great especially after I changed the shocks as well. My stock 15's don't rub when turning or over bumps either.
Some quick tips : to remove the rear springs just put load on the suspension system by jacking up the control arm until the spring compresses, then all you have to do is remove the bolt on the back of the control arm. For the fronts you will need the special Mercedes spring compressor which you can get for $60. I tried the 2 standard spring compressors found at auto parts stores and they did not work with the Mercedes springs.