What is the difference between the Bushnell Holosight and the new Bushnell Holosight XLP. I see the Holosight has a 40 hour battery life whereas the XLP has a 100 hour life. Other than this, the only difference I can find is the newer XLP is about $40 cheaper most places. What are the other differences? This will be for an AK or AR platform, so what would be preferred: Holosight, Holosight XLP, or just skip the Bushnell and go straight to Aimpoint's Red Dot line?