Things I liked:This dot scope is a great value. The scope is parralax free as far as I'm concerned. For my eyes the lowest green setting is great for aimed shots on my EBOS, red for full auto and brightly lit outdoors shooting as it's easier to spot. The quick attatch / detatch knobs made instalation a breez without the use of tools. Clear optics and fairly sharp dot on lowest setting. Flip up lense covers are great but they go vertical blocking your vision above the scope when shooting with both eyes open. Goes from red to green in two click turns of the turret. Great price for what it does. Looks cool? Wonder if it could hold up on a real fire arm like a shotgun. Hmm. Things I would have changed:Make the lens covers stay parallel with the tube when in the open possition. Stock risers to clear the high sites of the Umarex EBOS. The overly large front post and dot on the Leapers co witness nicely, but I prefer a larger field of view so I detatched the rear site on the EBOS (useless anyways) improving the view greatly. Stronger battery life. All the gripes above aren't deal killers again because the value for your money if they changed all the above it would cost an arm and a leg. What others should know:I wanted a red dot scope to install on a CO2 bb machine gun known for poor sights and less than stellar accuracy. This makes the EBOS alot more fun and easier to hit with than without. It would make a high quality air rifle quite easier to use if not deadlier. If using on the EBOS you will have to unscrew the rear sight unit as the open sights together will not allow the covers to function due to insufficient rail space.