Yup, the modification to the harness allows for full compatibility, both stereo streaming and voice control of both RNS510 and 9W7. You can control bluetooth via either the MFD and the RNS510, however to get it to display in the MFD, coding is required.
OK, so the navigation part of it is alright, if I just want to get somewhere with minimal effort then I use it, the instructions come up in the MFD as well which is nice. However some of the routes it chooses are very peculiar, the speed limits it displays is wrong, there is no warning for speed and traffic light cameras and the estimated arrival time is WAY out.
Also the latest maps disc that is easily obtainable has no traffic service, but while CD_7703 does, the TMC service in Australia is super, super bad. (Google search Suna Traffic). On the rare occasion it does work, messages only come up if the traffic is worse than usual (thats is if they come up at all). Eg: Rosanna Road through Heidelberg is a nightmare every morning, and therefore no message is broadcasted. However while a TomTom takes traffic history into account as well, the RNS510 does not, and therefore will drive you straight into traffic, if that traffic is there every day at that time.
During peak hour I always use TomTom on my iPhone with live traffic, as the routes are better, it avoids traffic, it tells me about traffic cameras and the estimated time is normally within 1 or 2 minutes of my actual arrival time.
However on the plus side the RNS510 does allow you to use the OEM Reversing Camera. Personally I wouldn't be able to deal with a third party reversing camera with a little screen attached to the dash. My plan to install the Reversing Camera was a large part of my decision to purchase the unit. The way the camera pops out under the boot latch is also very cool. =D The touch screen makes using your mobile much much easier as well, as using the MFD for telephone is really quite frustrating. While you could just buy RCD510, I decided the few $100 difference between the two was worth it.
EDIT: Also maps tend to be rather out of date, 2011Q1 Maps became available on the internet in 2012Q1.
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