I just bought a Nikon action series on sale at cabelas. great glass but there porro prism, so more bulky but generally porro offer a much better bang for the buck than roof but are heavier and bulky. I bought them for the truck so I don't care. I have a pair of way more expensive minox roof prism that I just took out of the truck this spring I thought that there just too expensive to get beat up in a truck. I will use them for hunting and stuff like that. dad bought a vortex diamond back last fall when everybody had them on sale for 200 bucks, its nice, my minox is nicer but cost 3 times as much. its not near 3 times nicer.