I had mine for a while now... maybe theres is 300-400 km on it. It was a New Old Stock from ebay. Made in 1977 with the nose slightly bending left. It took >200 km before the saddle comform to by bum. I had experimented on the tilt a couple of times. When using drop bar, it is almost level. But now I am using straight bar and raise the height on the stem, I had to tilt the nose up slightly, to avoid feeling cramped between the saddle and the cockpit.
The best thing for me in using the B17 is how my gonad does not feel hot nor numb after riding in the saddle even for long rides. This is the biggest difference I felt after changing from myriads of saddles before, and I notice the difference even before the B17 was broken in.