Top load battery is amazing. Shake awake is very sensitive so if you are wearing this on an edc it will probably always be on.

The glass is also perfectly clear with no tint or fish-eye at the corners. It has a large clear window and the red dot is crisp to my eyes whereas many competitors are not.

The laser itself has too many lines and has a big red outline making the laser have a starburst look. Not up to par with the competition.

Full power this thing only lasts for 4 days. Sleep mode is after 14 hours which is why the battery life in this unit is way way below the average for similar models. Most don’t have the time to fiddle with inaccurate search results.

Holosun 510 is far superior to the cheapo red dot clones. Wide view, great adjustable reticle. X magnifier it is great.

Holosun has very a strict warranty, don't end up with a 300 dollar paperweight like i did. I find this to be completely unacceptable and have already started my return. Its a paperweight at best.

Light coming from where it projects the reticle onto the lens is distracting. Battery life is terrible and the brightness is not that good.

Holosun sights are great sights, but the experience with this seller was horrible. No quality control sticker like reputable manufacturees have from the last one to check it prior to shipping. Beware on fake holosun products.

One unit failed to power on despite a battery swap, the other has a recurring reticle surge from dim to bright. That's just unacceptable for a $340 optic. Buy vortex or eotech instead.