Everything mentioned on that website was pretty accurate but hasn't been updated since feb 2012. Things have moved on a bit.
i had an autocom system for a few years and found it pretty good. back then everything was wired and fm radios. these days everything is blootooth the most popular of these i would say are
http://www.cardosystems.com/scala-rider
and
http://autocom.co.uk/bike-to-bike-communications.html
niether are particularly cheap and i'm fairly sure someone will be along in a minuet to tell you about all the other options in great detail.
I now have the scala rider Q2 pro. can connect to pillion and another bike with compatible headset. clarity is very good. also connects to phone or i can connect to sat nav. And through that to phone or mp3 player. can't fault it. all i can say is do as much digging as you can. make your own informed choice. as individuals tend to be biased.