Do you guys think it is worth going for the Cod Bundle for the 1TB HDD? How difficult is it to upgrade the HDD in the XB1?
If it is easy them I might just get the Sunset overdrive bundle for £100 less and put in a HDD myself.
Changing the internal drive voids the warranty as you need to take the console apart to access it.
You can use any USB 3 external drive over 250GB. Usb powered drives work fine as well.