Got myself a headset after checking out a friend's unit. bit over $200 inclusive, from the source online store.
Installation was very easy, it came with an "U" bracket, one side goes between helmet shell and padding, one side goes on the outside; or use supplied adhesive mount.
The headset has three buttons, one big multi-function button, one vol up, one vol down. It uses adhesive/velcro to mount the ear piece, with a mic attached on the flexible boomstick.
After pairing with my iPhone, it was able to use iPhone's voice dial (same as holding home for 2 seconds) and access all my contact by name/nickname.
To make a call:
1. Press multi-function button (MFB)
2. Headset beeps, then iPhone voice dial beeps twice.
3. Call name, iPhone says calling name, I can say no to change contact, or cancel to exit
To receive a call:
1. Both headset and phone rings
2. Either press MFB once, or say any word to pick up
The speaker works great for city riding, but on the highway it was difficult to hear although still manageable. Mic works extremely well, both city and highway, receiving party can hardly tell I'm on the bike (depends on your helmet, with my friend's Icon I could hear his high pitched exhaust baffle, but my Shoei with unbaffled exhaust is very quiet).
To use as full duplex (listen & talk in real time) between two and only two headsets
1. go though an insane set of initial setup procedure between to headsets, repeat for a new headset not previously recognized (paired).
2. once two headsets are acquainted, talk between two headsets up to 150 metres apart.
3. when your phone rings (see below), press MFB to pick up, then manually switch to intercom again.
*. switch between intercom (press & hold MFB for 3 seconds, beeps twice) and phone (press MFB, beeps once).
Con. while in intercom mode, it disconnects from phone, so you need to listen/feel for an incoming call coming from your phone, then switch to phone mode to pick up
On 4 hour charge, it provides 10 hours talk, 700 hours standby. Fully waterproof with rubberised casing.