I personally have just broken my fair share of scopes. Almost every time I've broken one it has been from dialing elevation into the scope and then something internally falls apart. Nowadays, I'm a firm believer in spending as much as you possibly can into an optic. However, there are still expensive pieces of junk out there. Personally I have NOT had problems with:
-US Optics ST-10
-Sightron SIII (two of them)
-Leupold Mk 4 4.5-14 (two of them), but others have had issues in the tactical matches
-Burris XTR 3-12x50
-Super Snipers
I have definitely broken several Bushnells, Simmons, and BSAs though and will not buy another "bargain optic", even for a rimfire.
Next time I'm going to give Nightforce a try.