Probably echoed everywhere here, but from everything I've read, Taurus has indeed improved their QC over the past few years, and have put out better products.
That being said, is it at an acceptable or comparable level to other manufacturers in the same price range? I don't think there is...
I have a 512c-gd, it's awesome. And the red version (which I prefer). I'm partial to red dots over lpvo's but both have their place. For 7.62x39mm I'd go red dot though!