I've got the exact same headunit and I'm more than happy with it. It's a great HU for the price.
The built in Parrot Bluetooth works fine (although you may need to update the firmware on the HU, depending what smartphone you're using), for it to fully play (and control) music from your phone but this is readily available via download on Alpine's website. You just update the HU with the software via Bluetooth.
Although the sound output isn't bad, it is significantly improved by wiring the HU directly into the existing wiring. Follow this guide, it's easy as peas: http://www.350z-uk.com/topic/58947-reduced-sound-out-put-after-replacing-oe-bose/
With the additional steering stalk, the only loss of functionality is with the phone. The phone button on the steering wheel now selects the source (radio/BT/CD).