I purchased two of these units online from Third Gear in late January. I tips me hat to Adrian at Third Gear for his open communication and speedy service and extra thanks for quick replacement of an AC power charging unit that failed. The unit on my lid has seen almost daily service over the last month. By chance the units arrived on the day of my bikes 12000km service. A quick glance at the odo shows 2484 kms travelled since then. I could have saved 20 bucks by buying off Fleabay from China...but Third gear offers 12 months warranty and being an Aussie store a few suburbs away ...it was a no-brainer to buy local. A quick read of the Chinglish booklet showed the units function bike to bike, rider to pillion and have the ability to send music or directions into your headset from your phone, MP3 player or GPS. Most of my use has been streaming music from my phone as well as taking calls on the fly and occasional pillion intercom duties. The book says 7 hours stand by and 4 hours of talk time. Most of my use has been around two hours at a time. You should get a full day’s use on a single charge. The unit clips onto the helmet using a small hard plastic bracket that slips between the shell and the liner; there is a lug on the rear of the unit that slots into the bracket, very simple yet sturdy. The head set consists of two ear phones and a boom mike that extends from the left speaker. Placement is taken care of by 3M adhesive Velcro. If you have a helmet with removable liners it’s a good idea to thread the mike under the cheek pad...otherwise after a long ride you get a line on your face from the boom. Installation is a snap and it’s easy to hide the wiring under the liner. I found it handy to add a small strip of Velcro to the inside of the chin bar to hold the mike in front of my lips. You can get by without doing so, but you do run the risk of the mike making its way up your left nostril when you put on your helmet. Operation is easy. Charge the units up by USB cable or mains power, the book says 3-6 hours but the charge lights went out in about an hour and a half. To switch on, just hold the rear-most button and the familiar blue flashing led shows the unit operating after a few seconds, keep holding the same button and the light flashes blue and red to indicate it’s ready for pairing. Enable Bluetooth on your phone and search for device. It will display on your phone as ‘motorphone’, accept the connection and you’re done. The book says you can pair up to three units. I have noticed that some overhead power lines make a buzz as you pass under them and that while I’m in the shed getting ready to go there is some static. On standby you can hear a faint buzz that is in synch with the led...like a pulse. Once music is playing, or you are speaking it’s crystal clear. A tap on the rear button opens comms to your pillion, either of you can open and close the link and the unit will return to whatever it was doing last...like playing music. There are a few seconds of delay as the unit switches from pumping tunes to chatting and vice versa. The volume is taken care of by two buttons at the top and bottom of the unit… opposite to intuition, the lower button increases volume. And no, there’s no problem finding the appropriate buttons in motorcycle gloves. After a few hours of riding with the unit it becomes automatic. Incoming calls are answered automatically, the music or GPS stops and hearing a rising chime is the time to turn the volume down. Phone calls are louder than music, not that it’s a bad thing but the first occasion is a surprise. The caller can sometimes hear that you are outside but has no idea that you are on the bike; the noise filtering is outstanding. Even riding at 80 with the visor up was perfectly clear. Calls can be rejected by pressing the forward button and if your phone supports last number redial, you can do that by pressing the same button. Voice is clear and easy up to 110kph, depending on your helmet and bike. The music is not Bose quality but is not so tinny that it’s offensive...listenable but it could be better with more bass. The units are not fully water proof,despite some sites claiming that they are. A bit of light rain is fine, but they are not downpour proof. I carry a freezer bag or three for items that must be kept dry if the weather looks a bit ‘how ya goin’. It’s easy enough to wrap a baggie over the unit and carry on riding and it works fine. I did get caught out; the rain just got heavier and heavier and I switched the unit off after about 20 minutes of drenching. When I got home the red charge light was on and I thought that I had fried the unit. I couldn’t get it to switch on or off...the lil red led was just glowing. I let it dry out and the next day after exposure to full sun for a few hours the unit was working as fine. I got lucky I think. I am amazed by how much power they don’t use when just pumping music to my head. Two hours of use and the units still only take 30 minutes to top up to full charge. For the money and my usage they are impressive little units.