I have tried quite a few different variations, Diamondback, Viper's, Razor, and Crossfire, and on a fair number of rifles also. My conclusion is they still need to work on things a bit, cause I can't get them to shoot worth a darn for me. I thought maybe it was just me, cause my vision is awful, there's no denying that. But I've had others shoot the same glass and on the same rifles, and the results are the same, blurry with lots of image / reticle shift.
There customer service is top notch though, I've sent like 3 scopes in, and they had them back in my hands in about 10 - 14 days.
At least for now, I think I'm gonna stick with Leupold.
GS