How's the Interphone F4MC thing working out boxy?
I've got the TomTom 400 now too, and used it in silence at the weekend. I've got my moulded earplugs but think something with the flat speakers mounted inside the helmet would be preferable, provided the sound travels through my earplugs enough.
So yeah. Simple. What's your setup?
(Primary reason I suggest the above is that I want to still be able to music through the earplugs and also hear directions... I'm internetting to see if the Interphone supports playing both. I guess it does!)