I traded my Shadow off as I already had two CZ85 Combats. As a B/C class shooter in Production I personally don't think I have the talent to take advantage of any perceived benefit the Shadow would give me. I have other issues holding me back from making GM than the gun. What it comes down to for most is a like for the Shadow, for some a desire to follow the leader and for others just ego. If you shoot the 75B well and like it, then stick with the gun. If you haven't already put a reduced mainspring in the gun and the trigger will lighten up for you. Put fibre optics on the gun, if you haven't already and if you like them and go shoot the heck out of the gun. If you want a Shadow, sell the 75B and buy the Shadow. Just remember a guy named Vogel won the World IPSC Production title with a virtually bone stock Glock 17. Just a reminder it is the archer not the arrow.
Take Care
Bob