IoT Bit (previously Pianywhere) to connect HA in car

Hello fellow HA users

I’m part way through automating my project boat that I’m living aboard - it’s great to control and monitor it when I’m out.

I want to add some extra functionally to my car (using my phone for unlocking, alarm alerts, etc), I’m thinking of using an IoT Bit (previously called Pianywhere) for get cellular connectivity.

It seems like a good product with some power management, and of course 3/4G and GPS.

Has anyone used one with HA on a Pi?

For those interested, I want to use HA so I can connect my car and boat instances via MQTT and control both in a single place.