I feel like I am putting words into @Heathen Saint 's mouth at this point, but as I understand it, it is not a digital version, but the actual chemical and electric impulses that fire up in your brain, but they now fire up in another medium. Like pouring the water in one glass into another glass: same water, different glass.
However, some of that water is inevitably left behind in the original glass, and each subsequent glass. That would be my worry. How much of me made the transfer? What was left behind?