I went on their website to check these things out (have read about them, but never looked into them) and it seemed like a neat thing to have for tuning and such; some good videos on the site to help out the understanding on what it does and how it works, fwiw. Does it act like a chip burner, so to speak, with a software program then, to make the adjustments vs. having to burn a chip each time? I take it this would be similar to having a standalone ECU in a way then.
Good luck with the sale and wouldn't mind looking into something like this some day. Now that Jeff no longer makes chips, this would a great piece for somebody to really dial in their car.