I have had a Shooting Chrony for many years (second or third generation) and a good friend bought a Pro Chrono, which was not in production when I bought my Chrony. We set both up and shot strings through both. The velocity results were near identical. The big difference was that I had several shots that didn't register on the Chrony, while his Pro Chrono registered every shot. If the Pro Chrono had been available when I bought my Chrony, I would have gotten the Pro Chrono, but I will keep using mine until it dies.
