Italy switched off some years ago. It was a long process, with some coexistence of the two signals, but the problems were never fully solved.
There were some political reasons (in those years government and TV where the same person) that dictated for a faster switch, even without an exact monitoring of the "on the field" situation.
Many homes in small valleys were served by "pirate" repeaters, built over the years, and nobody had an exact number of them, so now they are not reached by the DTV signal. The solution was to offer them a low cost satellite dish + receiver kit, and rebroadcast all DTV signal form satellite.
I have some receiver boxes (I bough one with money from the government), but they never worked as expected.
New TVs with integrated receivers work better, but a government regulation do not allow to rearrange channel order, so I have to scroll through tens of channels I'll never watch to reach the few I prefer.
A big problem was with radio microphones and In Ear Monitor receivers: the used frequencies located between two TV channels, and now there is no more free spectrum.
If you happen to be near a DTV transmitter, you cannot use your equipment. this was a disgrace for touring shows and OB vehicles.
Best regards