Well what can I say, a simple product that was simple to install. I have to admit I was a little apprehensive about this being sold as a "professional install" product, but I needn't have worried. Admittedly, I don't have a posh head unit into which to plumb the muting option, but that would only be one extra wire. The wiring was simplicity itself, it just needs power and a feed into your accessory circuit. If you've ever fitted anything to your car, then this should be a doddle. The main unit and speaker required some drilling, so not ideal if you have a shiny new car, but on my old shed it wasn't a problem.
I've had no issues with my phone hooking up over the bluetooth (although it is a Motorola, so that would have been a worry) and for the limited number of calls I've had since installing it, I have to say it's been very clear.
The biggest problem was then finding a holder for my phone.
In summary, given what you get for the £30 I paid for this, I think it has to offer the best integrated solution for the money.