It is limited because Dunu only had 300 pieces of blue and red faceplates, but Dunu can easily recreate SA6 Ultra with different faceplates, name, and without the Z Reviews branding and accessories like the Dekoni eartips. The original SA6 is in need for an update and it just doesn't make sense for the updated version to be limited. No brand has ever made updated version limited, imagine if the Blessing 2 Dusk was limited it wouldn't make sense. Every brand has capitalized on their popular products, just look at the number of versions on Shuoer S12, Tin Hifi P1, even the 7Hz Timeless will be releasing a new AE version, all these updated versions from various brands are not limited. Dunu would not waste this opportunity to capitalize on their most popular product, it's in the nature of businesses for their survival. The regular release can be named SA6 Ultra but with different packaging, without the "x Z Reviews" on the box and different faceplates. Do wait a few months for the regular release of Dunu SA6 Ultra.