Actually called Tecstar electronics you can find their motorcycle coms site at www.starcom1.com.
I've had their basic unit for years but I posted it on Monday for an upgrade to the latest digital model. The got my credit card details yesterday and it arrived before lunch today (With a couple of accessories still to come).
They are genuinely nice people with a great product.
I visited them last year with a mate who was having problems fitting his to a Harley and they came out, jiggled and poked and simply provided new bits and fitted them for him.
The upgrade unit will simply plug in to my existing cabling but I will also be able to use some additional functions so when I get a chance to test it I'll write a review.
The new kits can not only have pillion to rider and bike to bike, but pillion and rider can have separate MP3 players and separate mobile phones connected.