Hey Der Stig, I drank the Weihenstephaner Kristallweissbier finally. It tasted great. Maybe even a bit more taste than the Ayinger hefe-weizen (which is my favorite). The only problem I found with it was the Kristall part. Its completely clear, it makes you feel like you're drinking a Weizen-light. I don't want to say it was more watery than a normal hefe-weizen, because it wasn't watery, but it felt more "drinkable" if it were a hot day.
All in all it was exactly what a Kristallweissbier should be. It tasted great and was crystal clear. I just prefer a nice unfiltered weizen.