Thanks for the update. That's exactly where I installed mine on the Elise. I was rather surprised that I could have a conversation at 80 mph with the base (non-insulated) targa top on, and that the folks on the other end heard every word I said. I haven't had a chance to try it with Siri at speed.
I do wish that it had +/- track buttons and a mode toggle button on the mount. It would be nice to bump a track without having to go back into the iPod or Pandora. Or to toggle to the radio without hunting down the app.
On the charging front, if Bluetooth, GPS, and audio are all going at the same time, it barely makes much progress on charging the iPhone 4. BTW, I decided to play it safe and swap out the 7.5A fuse for a 15A fuse the radio circuit (to match the one in the head unit). Teslas may vary in that regard.
My unit didn't come with a Euro-style ISO DIN connection harness (despite what they show in the online manual), which would have been plug and play. The harness was just tinned wires. So I had to crimp it to a VW connector (and reverse the switched/constant power leads). The O'Car has bulky plastic caps over the RCA connectors, and they tend to snag within tight confines and eats up some of the available space for cables behind the head unit.
I was very happy with this unit during a cross country drive. Nice investment. The mount has zero vibration despite being in a Lotus with sport suspension. Very impressive. All in all, it's probably my favorite iPhone head unit so far. It really works well in a 1DIN space environment.