I use this on my $2100 NF F1 scope. It is silly to have fine otics and not protect them. I have at least 5 of these on my optics and would not use anything else...and OP always has the best pricing as well as service.
Pros: very protective, very well made
Cons: none
                    
This review was written in the old system and had content requirements that are different than reviews written today.