Now that ghost rings have been available for awhile for XD's, I'm wondering about real-life evaluations. I find that peep sites really help me when shooting rifles. I have a hard time picking up the front site due to aging eyes. It seems like ghost rings might be a good idea. From some time ago, I bookmarked an Entreprise Arms site selling ghost rings. Are these a good brand for the XD? Any others that should be considered?