As many members know, I own several brands of several scopes. I own Nikons, Leupold, Bushnell Elites, Burris, Nightforce, I think a Zeiss Conquest, and some others that I can't think of right now. The brand of scopes that I have the most of is probably Nikon, followed by Leupold, and then Bushnell Elites.
I have a Burris Black Diamond, and somehow it got a little scratch on its outside lens. I have no clue how this happened, but I was not happy when I saw it. If memory serves me correct, I bought the Black Diamond series back then because it was supposed to have some special scratch resistant coating on its lenses. I have a bad taste in my mouth with Burris, and it will likely be a long time before I buy another Burris product.
Again, my favorties (that I own) are Nikon Monarchs, Leupold VX-IIIs (and a couple of the older Vari-X III models), and the Bushnell Elite 4200s.
I have never had any problems with any of my scopes. In fact, I once had my rifle dropped and it slided down a very steep hill. I thought that my Nikon scope was damaged for sure. Guess what? Not only did it not have a single scratch on it (scope or body), but it still shot bulls-eye!