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!