yeap, I just came back. I tried both in the Autobahn (up to 140 mph) and in city traffic. Verdict: great improvement. The snatch is gone, just like it says on the webpage. I closed and open the gas in many conditions (speed and load) and it's a lot, lot better. After a while you just forget about the issue, which is the way it should be. Before I always had to be careful when opening up the throttle, now I just do it and no hesitation. It's like the injection has been "repaired".
I also noticed (or at least I think it makes sense) that in order to make up for the slower opening at the beginning, the new cam profile must have a slighter bigger radius at the end, because the bike is like more reactive, say, with 75% open throttle. Nice feeling.
After a while I started trying to provoke the injection snatch to no avail.
Good product, but I can't help thinking why Kawasaki doesn't supply this bike like this from the box...