I wouldn't label as a side-grade, but could see how you might see it that way.sounds like you guys view the hero as a side grade compared to the z1r and Solaris? Any impressions of how hero stacks up to the U12t in terms of resolution and bass?
I am still getting to know the Hero, but I'd say (thus far) it just has a different signature than the Solaris 2020. Side-grade vs up-grade vs down-grade will just depend on your preferences. For me personally, I intend to keep them both because the differences are sufficient enough to warrant having both.
I haven't done an A/B with the U12t, but I plan to.
My guess is that the U12t will best the Hero in terms of sheer resolution, but fall short on bass.