Bests & Worsts Reviews from Amazon

I have purchased this based on an extensive review by B. Berkowitz, so I will only add/clarify a couple of points to that great in-depth review. I have a similar situation, i.e. a car with Bluetooth support, but only for phone calls, with no way of streaming music from my Android smartphone. I wanted to get rid of clumsy audio cabling and listen to music via Bluetooth using the Kinivo adapter, but at the same time continue using the original car BT connection to receive/make phone calls. This dual setup is important, because that way the phone connection works in ALL Radio modes, not only in the AUX mode. PRO No. 1: The device is fully compliant with this dual-mode configuration. It is important to emphasize that a BT-enabled smartphone CAN be connected to multiple Blutooth devices simultaneously, and this will be causing no conflicts as far as each device provides a different SERVICE (in Bluetooth lingo each separate service is called a PROFILE). One can easily check all services the device provides going to Settings - Bluetooth (Android) and clicking on the Settings icon (looks like a pinion) located to the right of each device. There are TWO PROFILES available for BTC450: Phone Audio (used for initiating or receiving phone calls) and Media Audio (used for listening to music via Bluetooth). By default BOTH of them are enabled. If one wants to use the adapter for both phone calls and music streaming, both check boxes should be left checked. But if one wants to use car Bluetooth for calls and BTC450 only for music streaming, then it is highly recommended to UNCHECK the first Profile (Phone Audio), so that there are no conflicts among Bluetooth devices. In this case the original car Bluetooth will be the only device servicing phone calls, and BTC450 will only be used for streaming music. As mentioned by B. Berkowitz, both BTC450 and car BT phone connectivity module coexist nicely, but the key here is to disable Phone Audio for BTC450. PRO No. 2: The device is compact, has no redundant components, and has useful Prev/Next Track buttons. Personally, I think that this simple design is a huge advantage. One really doesn't need a separate display on an aftermarket part which should be as small as possible, and you can always clip your smartphone to the windshield and see all required song-related info there. Also, some people criticize BTC450 for having no backup battery, but in my view it is absolutely redundant in case of car audio, where one always has power when listening to music through the car audio system. While the display or a backup battery are just not needed in real-life situations (just adding weight/cost to the system), the Prev/Next buttons are useful, because it is easier to press one of these compared to reaching for a tiny onscreen button on the smartphone. In my case the device got connected and started working immediately and effortlessly, and everything is working as expected. OBSERVATIONS: 1. In my car the power socket is always on, so I expected the device to be always on, that could potentially result in a quicker battery discharge over time if left plugged in. In reality the device stayed on while my phone was within reach (including overnight at home, where it was within the reliable connection distance), but when I spent an hour away from the car, the BTC450 actually went to sleep. It didn't create any problems, I just pressed the main button once, and got reconnected immediately. But this probably means that the device does NOT stay on endlessly when the phone is removed, but rather goes into an energy-saving sleep mode. So one still needs to activate/reconnect it when returning to the car (which is very easy). For cars where 12V plugs are only switched on together with the ignition this should not be a problem at all, as far as they should be auto-connecting to the phone when powered on. 2. My only minor suggestion is to provide a removable power connector plugged into a separate USB socket. At the moment one has no other choice but to use the 12V connector included, and the BTC450 power connector is attached directly to the 12V adapter. In case smth. happens to the adapter, or one needs an adapter supporting a higher current, this would complicate things. If a standard USB detachable power cable was used for BTC450, any dual-USB car adapter would work...