First impressions - Holosun HS510C 1x0.91-1.2in Open Reflex Red Dot Sight

Just received my HS510c in the mail after a 5 month wait, well worth it. The sight itself seems to be well built and fits snug on my upper receiver rail. It is important to note this is a REFLEX not a HOLOGRAPHIC sight. Holosun did their homework and managed to isolate the specific wavelength of the LED and created a coating (red tint) on the main lens that reflects only that specific wavelength, allowing for ALL other light to pass through creating crisp and clear sight picture. When inserting the battery tray it makes a very positive click ensuring a water tight seal. Time will tell if Holosun lives up to their claim for long battery life. The only issue that I have with it is the location of the controls being on the side of the unit. I am aware that many other Holosun models have the controls on the side; but for the 510c it is a bit difficult to work them from a shooting position. I would prefer them to be located on the top rear of the unit as depicted in some prototypes.