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I prefer this sight, I have it on ALL my Glocks. I'm not a fan of three dot, and I don't like the factory Glock sight either. I just think its easier when there's only one dot to see, and the rear's will fall into line on their own. I like the XS rear too, it doesn't hang up during the draw. I also know several cops including my shooting teacher who use these on their duty guns.

Meprolight's are good too, I have them on the front's of my S&W TSW pistols, and plain black sights for the rear.

I am also getting the XS big dots fitted to my Model 60 and soon to arrive 640.

Check Midway USA, they usually have a good selection and sometimes they go on sale, I bought a couple for $80 recently. Give them a try, worst case you take 'em back off and sell them at a show and loose a couple bucks.