Cant help with the inter phone, but me and the missus have Nolan helmets with the Bluetooth which works really well, even worked bike to bike when she was out learning on her old 125.
Hi, I have an interfone F2 so I can't comment on bike to bike, but for GPS and phone connection it is very good. Volume is nice and loud even through ear plugs. Mind you above 60 it's not quite enough, but to be fair, no other comms system is good above 60. Duke
