Eibach manufactures Carlsson springs. I was debating between Eibach and H&R. Eibach was to be comfortable and not lower it as much. But the H&R was supposed to lower it more, have better performance and a 'ok' ride. However, I am very satisfied with the H&R's, that were even cut half a coil.
I just installed a set of Carlsson springs on my C240 recently. It dropped for about 1 in., very subtle difference, and ride is barely affected. I loved it, it's perfect since I didn't want it too extreme.
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