I think this stuff about Glock triggers is Crap, right along with the fact that Glocks never break, it's "always" shooter error or aftermarket parts that cause malfunctions.
I bought my Glock 17 in May and have put about 5000 rounds through it since and I haven't been able to drift my sight back to center yet. The whole time producing consistent, tight groups. Don't tell me because I have my sight drifted to the right that I don't know how to shoot a Glock Trigger. That's why they make adjustable sights, to compensate for variances in shooter and ammo.