This board has all the V3 features that you’ve been after.
Autoresponse (fires when pull and release)
Off the break Full Auto
Off the break Ramping
Full Vlink Support with Vlink Cable and Software Included
Fully adjustable Dwell
Fully adjustable Debounce
Many eye modes and adjustments
Backed by 100% lifetime warranty
This board is a drop in replacement for Bushmaster & BKO markers. It can also be installed in Freestyles and Promasters with the addition of a trigger switch to the wiring harness (requires soldering 2 wires).
The Vapor Works Chaos 2k6 Board is older, so while it may be available used and in a few cases new, it is not commonly available anymore.