I'm not sure what the appropriate area for this post should be but I'll throw it here.
I am building another CO gun, a gen4 17, as backup to my original. The red dot has had a major impact on my ability to hit what I'm aiming at. These moderately old eyes just can't pick up the front sight anymore. Too much fuzzy!!! Everything I read indicates that the red dot WILL fail at some time. Therefore, the backup gun.
Maybe there are better choices out there for CO than a Glock. For me, the fact that they simply run is a major attraction. Non-fussy guns are great. Readily available parts and mags is a definite plus. The fact that I can work on them and plug and play parts easily is another plus. I am finding that big flat grip area makes it easy to get a good hold on it and the dot arcs predictably for me. At this point in my USPSA career, the Glock isn't what costs me points. I would overaim and exit/enter shooting positions not so great regardless.
This AM I boldly whipped out the Drem*l and polished the trigger group as per Internet instructions. As usual, it made a world of difference.