Hi Rod and Frosti,
I am considering the 550 but wondered how you got on with the Cardo Scala headset?
My wife rides too and it seems to read that the Cardo system does bike to pillion but not bike to bike.
Another option seems to be the Kroozeez interphone system for bike to bike, but glueing bits to your helmet sounds a bit iffy!
Your chat about mono quality sounds poor, I presume you mean mono through both ear pieces and not sound just through one earpiece? What do you think about the sound quality?
Any good advice for me would be greatly appreciated.
Cheers