I picked one (6-24x) up as a cheap entry scope for trying some PRS matches with a .223 gas gun last year..
It seems OK, doesn't blow my socks off. Definitely not the light transmission of a Nikon Prostaff (also a relatively cheap scope)I have on my Tikka T3, but that's only a 3-14x. Bang for the buck it seems OK, but I don't dare go look through a nightforce or some of the other stuff I see on the range.