For you those of you looking for a bargain like me... Android has an app called "Android Intercom"... Its free, and all you need it your own headset to make it work... It works over Bluetooth and Wifi... I am sure range is not great for bike to bike, but for rider to passenger it should be great...
Already purchased and installed a headset to mount in the helmet and used it to make a call.. have not tried it with the intercom just yet...
What kind of headset did you get as this sounds interesting
SENA SMH-10. For years now. Great unit.