I have no experience with the fixed power scopes, but have 3 variable grandslams. I think they are exceptional scopes. The optics are great on or above par with the leupolds, & bushnell 4200'sI own. The adjustments are terrific and repeatable. They use the Microtrak system that has been used on the target models for several years. I would say that it is a much better scope than the burris you mentioned. The only complaint I have with my grandslams are that the eye relief is short. Though my experience is limited to 6.5-20 power scopes, and the fixed may have sufficient eye relief.