My 2 cents worth
I spent a helluva lot of time and money researching this and finally decided upon the Baehr Ultima XL system. Installation to the busa was fairly simple since the tank so easily lifts up. The Baehr system works well with many components and has all the features you should expect from this type of system. Some of its features are
1. Rider to Pillion - this is seemless. My daughter and I ride together and the moment she speaks the system drops down all other coms activities (mp3) and allows us to chat. The clarity is amazing and it is no different than having a conversation with someone in a quiet room at almost any speed.
2. Mp3 - I currently use an Ipod as my mp3 player which works very well as the system places music on the lowest priority and lowers the volume for other activites like voice or phone calls.
3. GPS Zumo 550 - The Baehr system has a bluetooth module that integrates perfectly with bluetooth devices such as your phone and the Zumo. Phone calls come in and the Zumo shows who is ringing and lets me answer or decline by touching the Zumo screen. Also the sound quality and microphone system also means that people who ring me on the bike don't ever know I'm on the bike speaking to them as it is so quiet.
4. Radar - The radar detector I have stealthed on the bike also feeds directly into the Baehr unit. The whole priority system on the unit allows me to set the radar as the highest priority therefore any radar hit comes through and mutes all other audio inputs.
5. GPS Zumo 550 - Another nice feature is that down here In New Zealand some clever bloke went and programmed all of the fixed speed cameras throughout the country and when you approach these cameras the Zumo starts to monitor your speed and screams in your ear to slow down until you pass by the speed camera.
6. Baehr unit comes with two stereo headphones built into your helmet. Fairly easy to install and customize in just about any helmet. Only thing that is annoying is the spiral cord that you need to attach to the bike from your helmet.
7. Push to Talk - I have hooked up a UHF radio (walkie talkie style) to the Baehr unit and using a button on my handlebars I can press a button and chat to my buddies on their bikes (we all have this setup) and chat to them. Pillions can hear the entire conversation but don't have their own PTT button.
All in all its a A1 system with heaps of features and toys. The only stumbling block is price in my opinion. The price I paid is in New Zealand $ so will have no bearing on what you will pay in your country but trust me if you want the best then this is the best bet. And it works a treat on a Hayabusa.
Gee that probably wasn't 2 cents.... seems more like a quarter
