Hello fellow Rival-S shooter! The SRO does have a larger window and allows more room for error when looking through it as to seeing the dot in the window even if is not perfectly centered. That being said, if you are not having a problem finding the dot in the window of your holosun, I don’t really feel like upgrading to the SRO is going to provide you any real advantage. As long as you find the holosun you are using to be reliable and are not having trouble keeping the dot in the window, I would save my money and stick with what you have.