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...In-car entertainment is fairly well-catered for. The Roadster's Alpine iDA-X305 stereo doesn't feature a CD player, but it'll let you enjoy digital music from an iPod or mobile phone with relative ease. Those who don't have an iPod can swap the iPod dock for a standard USB port, though there's also the option of streaming Bluetooth audio (plus hands-free Bluetooth calls) from your mobile phone to the car's excellent loudspeakers...
Alpine IVA W900 is bad to worse. i don't think any alpine is better?
That's why I opted for the standard one din audio. I will only miss the rear camera.
I found the car was very scary to back up with out a rear camera, and had one installed as soon as I could.
I'd considered adding one. I had thought I might need one since the rear window is so small and due to the body sloping down from the roll bar the whole way to the tail, but I've found the visibility to be little, if any, worse than the other roadster's I've owned. So I don't think I'd use a camera if I'd gotten it, but I've also never had a camera, so maybe if I'd already been used to one I'd think differently.
...You can see directly behind you, but not to the sides...
I can see to the sides during parking better than I can during lane changes on the highway (i.e., more time for a better look, without me moving in the opposite direction), but any safety device that helps some is useful.