Barrie,
No, they didn't replace the steering box at all, they removed it, resealed it and replaced it. Can it be adjusted? I'm not super familiar with these. I don't know what kind of magic they used on it but it is totally tight. There is practically NO play in this wheel. My car only has 88 thousand miles on the clock, so it shouldn't be too sloppy.
Jackmac, if your steering box was leaking, you'd know it. Mine was leaking all over the ground and the resevoir was dry. Plus it was very hard to steer. The Steering box is definately something to look into. I am very happy with the results, and the price was not bad either. I don't even have to return my wifes Christmas present... She'll be happy too!

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Kyle De Priest
2007 e320 Bluetec
2013 GLK 250 Bluetec