I have 2 LC9(hammer) pistols, and I just bought the LC9s Pro. I never felt the original trigger was that bad, as I was brought up shooting DA revolvers, and I own, and shoot, quite a few DA revolvers.
Shooting my LC9s Pro is much different than the hammer LC9 gun. The trigger is reasonably light, the break is much shorter than the original, the trigger stops immediately after the break, and the reset is much shorter. I think Ruger really got it right this time with the LC9s and LC9s Pro. I suppose I can see how a ND can happen reholstering the striker gun without a safety, but you would really have to do something stupid to have a ND with your finger on the trigger. It has quite a bit of take-up, then the cocking portion of the striker is definitely felt, and somewhat long.
This next comment applies to the Pro model only, In my opinion, the omission of the safety, and the magazine disconnect, makes the Pro a superb pistol. 2 other changes from the LC9 to the LC9s, the Loaded Chamber Indicator, and the internal lock are both gone.
I also noticed that the magazine latch is very positive on the new LC9s gun. I have had problems with my original LC9 dropping the mag under recoil, with the pinky extension installed. I went to the flat floorplate, and it didn't seem to happen again. Checking them side by side today, the original latch feels mushy, and weak. The new latch snaps in place, and requires a much deeper press to release the mag.
So, in my opinion, not only is the trigger vastly improved in the striker fired version, there are 5 other improvements with the LC9s Pro, compared to the original LC9.
No Safety
No Magazine Disconnect
No Internal Lock
No Loaded Chamber Indicator
Improved Magazine Latch
Ruger was smart to design the new pistol so the original accessories are compatible. All my magazines work, my Crimson Trace Laser Guard, and all holsters are still useful.