This Premium Bandai product arrived yesterday. I did a mock assembly of the G-Line Standard Armor (hereafter referred to as G-Line ST). The mock assembly took a really long time because I was simultaneously working on things like sink marks, gate removal, and seam removal (lol).
My initial impression is that it's a really great kit. I mentioned seam removal earlier, but the only seams that were visible were the Gatsuma. The others were made less noticeable by using step removal and other techniques, so there was almost no need for any additional work. Plus, the colors are pretty well-differentiated, so I think you can recreate most of the kit with just partial painting.
After this, I'll be using plastic plates and carving lines to add more detail.

(In progress) RX-81ST G-Line Standard Armor | ぽち's Gunpla works