CW,
The problem I had with XS sights was related to personal preferences than anything else. In spite of all the years the military ingrained the "6 O Clock" hold into my head, I still prefer my pistols to shoot to the top of the front sight post. I like a lot of light around the front post, which seems to serve me well with the quick shots, without sacrificing precise shots at distance.
While not a target pistol, I've yet to find a Glock that didn't shoot satisfactorily. Funny thing, offhand I tend to shoot the 19/23 better than the 17/22 size. From the bench, I shoot the 17/22 frame size better. For all around carry and defensive work I think the 23 is just about ideal. I like my mdl 36 for occasional carry, but it frequently looses out to my Officers 1911. The mdl 23 with 16rds of .40 is just about the ideal package for concealed holster carry. Enjoy yours, now you've got me thinking about another 23!!!
Savage