Cypher, since it sounds like the throttle is still in its infancy, here are some humble suggestions. In order for me to be interested in purchasing a VPC throttle over my HW throttle, it would need:
No play or wiggle in the axes
Hall or MRS, no potentiometers
Metal switches, not cheap plastic ones as in the concept renders
Switches make one press per direction (no "release" actions, please!)
A simple metal base, the "brushed" look in the render is cheesy
Replace the single red thumb button on the throttle with another two or four-way hat... I seriously think no HOTAS sold should feature less button combinations than the HOTAS Warthog. Matching the high functionality of it and similar Western HOTAS should ensure that no aircraft is "left behind" by your hardware
A pinky switch for master lights control (found in nearly all western fighters and jet trainers)
I'm not a big fan of the square plastic buttons, but I understand this is just an Eastern design convention and makes sense when using the T-50 HOTAS as a template.