I recently had them installed on my XD9 Sub. I was concerned I wouldn't like the 2 dot arrangement, but it works just fine. I switch back and forth between this and my XD9 Tactical, which has a more traditional 3 dot Tritium setup with no trouble. I think you will like them.
Here's a rear view taken from Heinie's website. I got 'em factory installed on my XD-40 and have been very satisfied. No problem in any lighting condition, indoor or out. My XD-9 subby has the traditional 3-dot and shooting the two alternately at the range presents no problem
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