[sonitex]

I know this is an old thread, but just got a HRP Si with Nav last week. Been studying the book about it and getting to like it every day. Here are the reasons I like the OEM (I had a Garmin 2720 I gave it to my son):
1. The steering voice command button.
2. Also the Back button that returns you to a previous screen.
3. I drove into Boston to a specific address and had no problems getting there.
4. When you press the talk button on the wheel it automatically mutes the stereo speakers.
5. When it gives you a voice prompt, it mutes the front speakers and tweeters. The voice prompts are transmitted through the stereo speakers. At Max Prompts, it also names the street to turn into.
6. It has a calculator function and conversion tables. If you select the "Automotive" conversion it will give you your MPG, or metric equivalents and much more. Still finding out new things.
7. Command of "Display Audio" works off any screen.
8. Display Set-up, and voice adjust everything on the screen (brightness etc.)
9. Clock display can be set up to match the Red Si gages. Can be an analog clock, or digital clock with day and date.
10. Voice commands for PC card player, CD player, XM, FM or AM radio.
11. I prefer the male voice over the female (selectable). Much clearer pronounciation. Female must be from Boston.
12. In any mode, when you voice command help, it will display or tell you the list of commands available for the function. So you really do not have to memorize the commands.

I could keep going. This is my first OEM car with NAV. Build date is 08/06 and the latest version DVD software 6.11C. I will not buy another car without an OEM Nav system. The Garmin 2720 was fine but not as good as the OEM.

Correction on item 7: The command "Display Audio" does not work as stated in the manual. It only works if you reverse the command, as I found out yesterday. The command that works is "Audio Display". And it works from any mode.
Correction on item 10: I was happy to see that in the Audio screen, it integrated controls for the optional 8 disc CD Changer I bought with the car. It shows up along with "FM1, FM2, AM, XM1, XM2, CD, PC, and CDC" CDC is the 8 disc changer.