Must be something in the air - I've just spent a couple of hours investigating the same thing.
I have a set of Eibach Sport Line springs waiting to be fitted to my standard dampers. I was thinking about replacing the dampers as well, and saw the B4 range.
The price is good for the whole kit that you linked to.
If you do buy, make sure that the Bilstien part number is correct, as some sellers are selling the incorrect part number (according to the Bilstein parts catalogue).
For a GTi it should be 22-140012 for front and 19-140025 for rears.