granted it does suffer with parallax as do all scopes and you can't fine tune your dot spacing. nice ret though.
Also the other night parallaxed at 25yds I was managing to shoot a 20mm kill @ 55yds with reasonable success allbeit the slight absence of wind .
I've not shot a comp with it though and I would imagine very unforgiving if you don't concentrate on eye position but certainly no more than the mtc viper.
The nail that sticks out gets hammered down.