The key issues are: the exchange rate applied and fees for withdrawing cash at i.a. ATMs. As this is Master Card I expect poor exchange rates (the usual 3-4% surcharge) and huge ATM fees.
I have yet to be convinced how Travel Cash will actually benefit me. I don't care about the advantages described above - not important for me as I often just bring some cash (Euro or DKK) for exchanging into the local currency upon arrival and use my MC or VISA as much as possible.