Unfortunately, for me, upgrading in the traditional sense (sending the unit in to Devialet) will not be cost effect. It would cost $4590 to send it in. On the other hand, if I were to sell my unit and then apply the funds to a new purchase it would cost me around $3500 to get the 220 Pro or better still around $1000 to get the 130 Pro (which is all I need anyway). So if I "upgrade" I will buy the new model and sell the old one. Fortunately, I don't have plans to do that in the foreseeable future.
"Dream as if you'll live forever. Live as if you'll die today."