But to qualify my statements the following are extracts from the Wiki Freeview article :-
Freeview-certified set-top boxes and IDTVs, as well as PVRs, are available at most major New Zealand retailers. Uncertified equipment can also be used to receive the service, which may have advantages (cheaper, extra features, international channels) and disadvantages (no/limited EPG, no auto-retuning) over certified equipment.
MyFreeview certification of digital video recorders is similar to Freeview certification, but also includes eliminating any practical means to skip over ad-breaks in the recordings or extract copies of recordings from the device.
I've also the user manual for both the XW-380 and the (non NZ) XW-480 which very clearly shows the differences and features removed to become MyFreeView Certified.