Used these to replace burris Zees on Savage 114 American Classic 30-06 because rearward scope extension was needed for matt Bushnell 3x9 4200 elite.  Eye relief now great and "saves" the excessively long savage action. Only gripe is that finish doesn't match and is cosmetically inferior to the burris.  Set up a little odd because of the windage adjustable feature, but they mated with burris tactical bases fine as following instructions put me 1" off at 50 yards.
This was my fifth scope mounting.
Pros: provided needed scope extension for savage LA
Cons: cheap weaver-like,  non-matt finish
                    
This review was written in the old system and had content requirements that are different than reviews written today.