When I made the choice for a front sight with a light in it for my SP101, I researched it down to two (the Mepro and the XS), then talked to the 'smith at the local shop.
He told me that he had done a few Big dots on SP101's and that the customers were not happy with the change in POI. I went with the Meprolight based on that recommendation, and I have been 100% pleased with it.
That is completely second hand information for you, but it is the most relevant info I can give.
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