I've got an intaride setup, Got it off Ebuy, and I'm very pleased with it.
The cable I have has a 'bullit' connector for easy plug in, the sound is very good up to 'interesting' speed, and the radio ( mine is the older one, the new '80 series' is even more powerful I'm told) is easy to use, small and you can get a bike power cable if required.
The helmet fixing was quite easy ( once I got the lining out of my Suomy) the stereo helmet speakers are slim and easy to fix, and the mike is good.
I only have the bike to bike setup, but I intend to buy the RP1 ( the box with connections for MP3, phone, etc, and vox ) I was loaned one in August by a mate, and I had no problems travelling down to london, listening to music off my mini disc player at high speed, when the PMR cut in it reduces the music volume and speech was easy.
I have also spoken directly with the manager ( can't remember his name,) at HP comms, whe sell all the bits and bobs, He was very helpful, he even offered to make parts up to try and adapt wires to suit. They also do an external aerial, that gives loads more umph to the signal, may suit over 'longer' distances in Oz.
www.hpcomms.co.uk
All in all I'm very pleased with the quality, reliability, and ease of use..
The MAIN reason I went for that make was Price... I'm not sorry.
Incidently, the person I ride out with sometimes has autocom ( another good system but more pricy) and he quite often comments on how clear the comms are from my system.
Hope this helps...
Murt.