Too those complaining about the Glock stock trigger, how many $500 poly striker fired guns have better stock triggers? The XD is OK, Ruger SR90? Smith M & P? Yeah right, the FNH? really? Sig 2022 (I know it's not striker)? The reality is the only one out of the box in the same league as the Glock is the XD maybe. And i'd take a Glock stock trigger over the HK's at half the price.
That said, changing the connectors and doing a trigger job are worth it on a Glock (My M & P .45 needed it far more). On my Glock 19 I have gone to a titanium guide rod/steel spring, shock buff, trigger job, weighted mag well plug, oversized slide release, trijicon nights, weighted Mag plates, and JP mag release. It is the most accurate combat pistol I own, although my Kimber Pro CDP will give it a run. I have the stock barrel, and the only way I'd change would be a threaded barrel.
My old Kimber eclipse 5" (had to sell) gave me 1.5" groups at 25 yards, my Glock comes in at 2.5", same as my CDP, not bad with the stock barrel.