I'm using the G4/G17 as my primary IDPA gun this year and my G34 for 3-gun and USPSA.
Though admittedly skeptical at first because of all the internet hype about the recoils rod issues. I have had really good luck with my Gen 4 G17.
I broke it in with 500 rounds of 147 FP molys and WST (in a LWD threaded barrel) then switched over to a couple hundred 124 JHPs and Power Pistol, followed by 124/147 FMJ's with TG. My favorite load with it is the 147/TG runs really well with it.
Glock 3rd Gen G19/G34, 4th Gen G17 FDE, G26,
Dillon XL650 & Super 1050B BLUE Kool-aid drinking team member