80% is exaggerating a bit, this particular model has the worst of any IOR and last I heard it was about 10%. And a good portion of those were from me.
Too high, nonetheless. I feel they rushed them to production before all the bugs were worked out.
The failure you had is the first one of that type I know of, so at least that's not very common. You should get a replacement and I'm sure it'll work well for you.
I don't recommend this model for heavy kickers at this time. I broke three. The last two likely would have lasted a lifetime one of my ARs or smaller rifles, but my light 300 RUM will expose any flaw really quickly.
It's a bummer, because you just can't get a scope that competes feature-wise and glass wise without spending twice as much money or more. The glass, the knobs, the tracking, the reticle...all just beautiful.
I do think your particular failure was an aberration you're unlikely to see again. If you were impressed with it before you even got it mounted, just wait until you have some trigger time with it. It's really a joy to use, you may fall in love. I will get another when finances allow.