That seems to be the common consensus among everyone so far. The custom stats really set the old relic apart from any of the stock weapons, including raid ones. In fact, the stat bonuses given with Zeta were so good (if you did yours right) that I found myself using my zeta all the way up to lvl 56-57 just because the secondary stats I had on it was better than the weapons found in game. I don't think I was alone in that, because I often saw Zeta weapons in dungeons as high as the Vault.
