Upgraded to Zbox. My old SG system worked great, but they weren't sure it was upgradable. I have the SG system plus two smart timers and a switch wire. I'd take $100 for it. I can look inside now that it is out of the boat and determine if it is upgradable (they sent me a picture that shows what I need to have).
I'm not sure if all DBW boats use the same system. My boat is a 2005 MC917 TT