I have a Delta Point on a PC40 ported and it's definitely a winner, but the pro addresses some of it's short comings.
1. Changed to MOA windage and elevation adjustments. No more torx head adjustment & locking screws.
2. Added a manual brightness adjustment to augment the auto intensity feature, which is need when fire from shade into daylight and when using a weapons light in close quarters.
3. Added a spring steel shroud over the housing for ruggedness.
4. Changed to a tooless spring operated battery compartment.