Sparco GSM pit to car - Anyone tried it?

[andye30m3]

Looking at options for pit to car comms for next year and noticed that the sparco GSM can be had fror under £300 at the moment.

Looks like it's just a case of a box with a mobile sim card that can connect into headphones in the helmet, which on the face of it seems like a sensible and simple idea.

I can't find any online reviews, has any one tried one or know anyone who has? and would you recommend it?