Thanks for the review. Of course I am biased, but I share the same sentiment about my Gunfighter Mk.III.
IMHO, it's an important evolution of the Gunfighter series, including some under-the-hood stuff I personally greatly appreciate - coming from the GF Mk.I and Mk.II myself - such as: less internal wires, and improved wire quality, addition of one more Micro Control Unit (MCU), allowing for improved sensor reading and less packet loss.
The new Avia S(oft) cams feel a lot better in the center: still smooth enough, but they return to center a lot better than the previous cams. I've put 2x #40 springs per axis, and I currently use the 10cm straight extension.