Dan,
Another potential issue with the dots sights is if you have corrective lenses and/or astigmatism's. At least that is what I have been able to gather. I have several different ones, and I do not see a sharp dot all the time, and the sights do vary. I generally recommmend to folks who may have this issue to try the sight if you can when you buy. Or try and find one with the smallest dot, or the ability to manually adjust brightness.
My Jpoint is the best visible for me, followed by the triangle on the Delta point that I returned. The Delta Point with the dot is my worst flaring dot in my collection, although the sight is still useable.
Craig
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Northern born and Southern bred