Your signature block shows VMSpc so I assume that's what you're referring to. The answer to your question is, yes it is definitely still good, with one caveat.
Your setup has a grey plug that connects to the grey diagnostic port at the base of your steering column. New coaches, those from sometime in 2016 and up, have green diagnostic ports, and your setup will not work the way it is. It can be sent in to Silverleaf to have it modified, but they charge around $100.
Since new ones retail for over $300 and there's really nothing to wear out, I would think you would be able to get at least $200 for it. Just make sure when you advertise it that you make it clear the purchaser's coach must have a grey plug.
2017 Tiffin Phaeton 40QBH
2014 Jeep Cherokee Limited