I am probably the last person here to comment on GWX, but I would feel bad if I would use it and didn't say a few words.
It is by far the best addon package ever released for SHIII, possibly even for all games I know of. If GWX was a commercial addon pack, I would not hesitate to pay the usual 20-30 Euro for such a product. It is detailed, comprehesive, balanced, professionally tested, and most importantly, thorugh the sum of it's parts it achieves it's aim, which is to make SHIII interesting again. I have not played much, but I was blown away by simply sailing out of Kiel. I felt no need to enter time compression for the first two hours
I also found out that the AI is much more aggressive, and that it's no more just a matter of getting into the right position and guessing the speed of the target, but that you also require luck and intuition to surive.
All in all: Great job!
One little thing I would change: After you have done such a great job with the background movie and all, I find the GWX loading screens a bit cheesy. It's of course no problem, but I could imagine a more serious impression could be made. Maybe it's just because I don't like dogs though ..
GE