Mario, the quality is right on with all the reviews on Amazon. No static and the sound is bright and clear across all frequencies. I'd definitely recommend this one if you are going to install it for your car.
As for the pairing, you just have to pair it once and it'll remember it. The on/off button is not too bad for me since I use the car for work (once to work and once on the way home), but it can be annoying if your driving needs are where you have to make a lot of short stops. The 555 timer is an awesome idea. I think you will need to add a 1 to 2 second delay though after the car starts before triggering the power button. The only nice thing about the power button is that I can play and pause the music on my phone without actually picking up the phone and going to the app. This is on the IPhone, but I'm guessing the other devices should behave the same.
Originally Posted by Mario
The reviews on that receiver look pretty good! How's the sound quality for you?
The worst part seems to be that you have to hold the power button to turn it on. Do you have to do that every time you get in the car? You could probably fix that really easily with a 555 one-shot circuit that activates when the car turns on. Do you have to pair your phone each time?