I purchased the grom audio kit, with bluetooth dongle a few months ago. Then @Simes showed me how to install it at the end of March. For the first week or two it was ok, and I got used to it. I even paid for the app to get rid of advertising... which was a nightmare as it displayed them whilst driving... Whoever thought that was a good idea is an idiot. Then the problems started. System would reboot randomly whilst driving along... often after no more than 20 mins. Blutooth would often fail to connect and then the USB connection started to behave oddly. If it doesn't work and connect first time... you have to do several things to try and make it. 1: Disconnect the USB, turn the car off and take the key out so the unit powers down... How many times it takes to work is completely random. 2: Turn Bluetooth on/off/on/off on the phone... it's a random number of tries it takes 3: It seems to connect, music starts to play... but stutters the same 2 second snippet of the song over and over and over until you pull over and do step 1 again... and again... and again. 4: It connects, it starts to play music... then replays the album from track 1 again rather than where it stopped playing before. 5: It connects, it starts to play music just fine from the same place it finished the time before... But cannot be controlled from the steering controls. 6: Fails to boot up entirely, attempting to select the aux channel from the head unit doesn't happen it just switches between CD and the various radio bands as if no Aux input was there again... leading to a repeat of step 1 multiple times. I even installed the app on my tablet (nVidia Sheild K1) and tested that... with the same results. That's running on Android Marshmallow whilst my phone is Android 5.1 or 5.2. I keep the app updated, I've updated the firmware on the device... but a few weeks later things got even worse... Now when it boots up.. Instead of saying 'USB' over the speakers... it annouces 'Are You Ex...' and is cut off during the 3rd word. I've emailed Grom UK as 9 weeks of use (2 of which I was in hospital/recuperating after surgery) simply isn't good enough... It's not an easy thing to install given the fact the whole dash/dvd/headunit has to be pulled out... But if they're willing to send me a replacement to fit (inc leads) before I return the old on... I'd try that. If they're not... then i'll pull it all out and send it back and get a refund (via chargeback if need be) if they turn out to be one of those companies that can't be to resolve issues. As yet... no reply. I'll give until the end of the week before deciding they can't be . It's a shame... because when it works (about 1 in 5 attempts), the kit is fantastic. It reads txt's, allows me to answer/ignore calls and plays all my music... I may just have a dodgy one and I'd love to give them the chance to rectify the issue. But I have a limited amount of patience too. Be interested to hear about any other experiences good or bad with these.