I've been looking at the various Dr type sights being made now by Leupold,J-P,Burris,Trijicon,etc,and have been thinking about having one installed on my Glock.I really like the setup Bowie Tactical is using with an additional rear sight being installed in front of the optic (Buis).My question is for those of you that have tried some of these,and whether you think any of them stand out among the others as being betgter quality with regards to toughness,reliability,etc.I see they do range in price from approx. $300-$600 (retail). Thanks