Do any of you use/prefer them? I recently rented a Glock 19 at the range that had a big dot site on it and had trouble using it. I found that it took up the whole X ring on the target and I was not able to see the exact spot I was pointing at. It was frustrating to say the least. I can see the advantage in using it on a home defense weapon as it would allow you to aquire and shoot center of mass easier than your standard sites. I just don't know if shooting for accuracy is an option. Anyone that uses or has used these site have any thoughts?