I just received my Solo from eBay. It's advertised as the newest model, but I received a M1C1 unit. Is it worth it to trade in for a M1D2? Also it's a silver Solo but I'm hoping to trade it in for a black one. On top of that they sent me the wrong case (it came as a package deal), so I could trade that in for the right one while I'm at it. Thoughts? Worth the trip to the post office? I have other devices to hold me over until it gets here, and I haven't picked up the water piece I was gonna pair with it, so the wait isn't a big deal.