One of my Pros had a case of gritty trigger, but cleaning out the grit and a little polishing on the SB and trigger bar took case of it.
Both my Pros settled down just a touch over 4#.
The 5" Pro comes with FO sights, the 4.25" Pro with night sights.
IMHO, the Pro does not "need" anything, but if you like the shorter APEX trigger, buy it. But shoot one first and make up your own mind. It is a current fad to seek lighter triggers to "cure" yanking the trigger.