My dad has the enhanced firing pin, which does indeed improve the trigger pull. Its very light with just a bit of creep. It took a bit of hand filing to get it to fit, and popped out of the gun during firing after about 20 rnds. Luckily it was easily put back in, and has not popped out in hundreds of rounds since that, so I think the detent wasn't engaged properly.
As Eric stated, you do lose the decocker function! I found that out the hard way, when the slide cut a nice little grove into my hand. Luckily I had the thing pointed safely downrange. I did the pencil test, to see if it was just a failure of the decocker. Hitting the decocker sent the pencil flying across the room, everytime. It had less velocity and traveled a bit shorter than pulling the trigger, but its obviously enough to fire the Czech mil ammo the gun was loaded with at the time.
Although it is faultlessly reliable (outside of the firing pin break and subsequent escape) with ball ammo, I wouldn't recommend it for carry with this enhanced firing pin. It is simply unsafe in any carry condition other than condition 3.
If carried hammer down, you must then thumb cock the rather small, strongly sprung, rounded hammer before firing. And the new firing pin appears to have disabled the hammer block safety, making it unsafe in the event that you drop it.
If carried cocked and locked, better not bump that safety up! The decocker requires little pressure to activate, so any false moves and the carrier gets to experience that muzzle blast and legendary penetration first hand. The holster better be fashioned from nomex covered LV IIIA kevlar.
If you think you're going to add the enhanced firingpin and make it strictly a range gun, remember that Decocker = Trigger, and be extremely careful allowing anyone to fire it!