It was absolutely bloody freezing, but fun and informative. I can't reccomend it enough, and our guide (Tam) was possibly the most over-informed tour guide I have ever met.
After finishing I was able to warm up nicely at the slightly strange Badesschiff (Bath-Ship) with a silent bunch of mostly Germans.
There is still a section of the wall which is earie in the extreme.
There are loads of cyclists and nearly all of them ride very practical bikes. Very practical. Heavy steel frame, front dynamo, Brooks saddle (or similar). Some ride traditional road bikes but the vast majority ride utility bikes.
Personally I think this is great.