I have the following Buckmasters scopes:
3-9x40 on my 223(was on the 270)
4.5-14x40 mildot on the 270
6-18x40 mildot on my 308 (turrets are very repeatable and always go back to the exact place after long range adjustments)
and a prostaff 3-9x40 BDC on my 50 cal muzzle loader.
I shoot a lot!!! Ive never had one lose zero, never had ANY type of problem out any of them like i had in the past with some crappy Tasco and simmons scopes.
When I compared them to other scopes in the same price range they always looked sharper and brighter. Plus they have a lifetime warranty.
To me Nikon is the best bang for your buck. Sure they are better scopes but I dont think they are enough better to justify the 2x-4x price of the nikon.