well the build-quality depends on many factors and the alu may not the problem, a lot of housing out there using 6061 and it's still good, and at that price I don't expect to get a 7075 case too (except the one from Ali), but the anod, I have some friends comfirmed the Duckmini2's anod surface is not so good, and joneslee also tell that the pcb coating on Buttefly got crack when he do the solder works
but dont get me wrong, I don't mean to talk bad or sth like that, just some thought and that Viper, its price, is one damn sexy case I want