Conclusion:
The G4500M seems to be the only solution in town, but it's a great solution, it's refreshing to see your one option being a great one. There are many BT GPS units out there to chose from, for about the same price, the RBT-2010 did everything I needed, plus has room to expand with an external antenna. And iGuidance is a great option for navigation, especially if you have a notebook with Bluetooth.
When all three are used together it's a complete solution. You could mix and match the GPS and software, but I know this solution works out of the box. As the weeks go buy i'll be able to go more in depth into funtions, surprises, even let downs if they surface.
You would be better suited to take advantage of the bundle Seidio offers to get the navigation software, G4500M and the BT receiver all in one shot, and save some money. Plus you can install it all in one day.
I am not one to spend money freely, but when I find a group of products that actually works as advertised, makes my life easier, adds value to my work day, and is easy to use, I consider it worth it. I hope this review proved useful to you, feel free to ask any questions you may have, and share your experience.
As a complete system, i give it a 9/10
The following are some other threads, with titles, that you might find interesting:
iGuidance thread
Seidio G4500M car kit review & discussion
My first business trip with my PDA/GPS. A critique.
Car kits
Vehicle / Car Mount Solution Thread
Best BT GPS for PPC-6700 and other essentials?