The RAM buyback was market value +10%. They may just offer September 2015 price, but given they actively hid the cheating since 2014 (US head of VW), well, you might be able to get more back through alternatives.
Best solution, ignoring environment is to get the fix and cash, then get it reflashed (Malone tuning). This way you still get performance.
Either way, they lost me as a customer.