I put this exact same unit in the GT. It's not too bad to sort out, slightly more tricky if you have Bose. I also had to change the roof aerial as I had ConnectNav. I have not yet been able to find a way to connect using the steering wheel controls but this is not a problem as you can use voice commands. One downside is that it turns off with the ignition so if you are in a supermarket car park waiting for your wife to finish shopping then you either have to put the key to the first position or leave the engine running to use it !!!
It really is great, initially it's a little distracting as there is a tendency to keep looking at it but once you get used to it then it's not a problem.