An open center has no impact it's still tiny and at the intersection of a crosshair.
I'm a little reluctant to disagree with the above, but that's the nature of these discussions to an extent so I will. I had a TMR for a while and with some very minor criticisms found it to be an extremely easy to use reticle. The one feature I miss the most was the small open center. I found I could "aim smaller, miss smaller" when a tiny portion of the target was visible. I find it interesting that folks who like a thinner reticle would not see the value of a 0.05 mil aiming point.
Added: currently using an MLR2.0 and liking it.
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