The Truthear Zero: Red solves most of my quibbles with the original Zero. Like its predecessor, it is an unqualified recommendation at its asking price. However, the IEM market has continued to progress in the year since the original Zero was released, and the Zero: Red is less revolutionary now than it might have been if released earlier. I cannot help but wish we had received this version of the Zero in lieu of the original.
My full review is up in my HiFiGuides thread and on my blog.