SWG is on of the most important Italian polling companies.
They run a survey asking questions about our digital identity system, which includes various authentication systems.
Results confirm that SPID rocks.

This data tells a lot.
Not only we know that SPID is used 100x more than CIE, the closest alternative
Now we learn that people with CIE uses it 60% less frequently than people using SPID.
That is, using smartphone-based SPID is correlated to usage of public administration’s digital services 2,5x as much as smartcard-based CIE.