This. The issue is that unlike most IEMs, turning up the volume doesn't make a much louder overall sound. This is part of his complaint about dynamics, which is totally valid. It won't ramp up amplitude for a crescendo section like the UERM or Heaven V (and likely VI). It's more like the JH13FP or the 1p2 in that cues hit a lower maximum with volume and other cues that are far back just get louder for the most part without a commensurate increase in the dynamic sections of music. This is IMO the main take it or leave it part for people that can deal with lower bass presence. It's a big one for me. If you look at all my impressions in the last year, you'll see it mentioned as a main annoyance in most things I hear. And the fact that I can overlook it due to the other things the rockets do so well is my personal testament for their sound.
The timbre is also among the best I've heard, even while tonality might not be the most accurate and brightened up a bit due to the 6KHz bump.
I can usually reconcile what I hear and what others say they hear on this forum. And usually it is just personal preference. Which I totally get. I just don't understand this time I guess, but then again, I guess it doesn't really matter.
And if the GR07 is more linear, and I loved the GR07, I'll eat my hat.
Ok I'm done.