Have a Ghost Edge in my G42, put one in my 43. Both reduced trigger pull weight (Wheeler Pull Tool) perhaps 1/2 lb. From other threads, appears you would want one of the several spring kits to bring it down to 5.5 lbs or so, from the stock (OEM) approx. 8 lbs. However, the Edge does make the trigger smoother, reducing the travel slightly fore and aft, and less snap at the wall. I like the Edge in both pistols, and have kept the Edge in the 42. Just installed the Ghost Pro in the 43, and after some armorer "fitting" (slight tool grinding of one of the fingers so the trigger would pull), I found no felt difference between the Edge and the Pro. Again, did not install a spring kit, but the Pro did reduce trigger pull about 1/2 lb lighter than the Edge (Edge 7.5 lbs avg., Pro 7.0 lbs avg.). Note that the Wheeler unit is basic and not digital, so some room for error. I still like it for the smoother trigger.
Finished 624 rounds (over a 30-day period) today, and have had no issues with the 43. Two failures to go into battery early in the 42's shooting were caused by limp-wristing. I had one FTE and one FTFire in one batch of Geco 115 grain ammo (which has been perfect prior to that), which armorer agrees was ammo, not gun. With a couple of add-ons, love my 42 for CC, but if Blackhawk comes out with a Serpa CQC holster for the 43, I will carry that, and keep the 42 for my backup. Hope you enjoy your 43 as much as I do mine.
And note that Guns & Ammo July 2015 just did a 9mm CC comparison test, including the 43.