I prefer the recoil on the 45 shield to the 9mm shield. The 9 mm jumps with more muzzle flip. The 45 just pushes back "less jumpy". I am able to get back on target faster with the 45 shield. The trigger is smoother in the 45 shield. The slide is smoother on the 45 shield.

If you are considering getting a 45 shield. I say do it!