Well I should probably give Sprint a call and see if I'm still allowed to return my 6800 (and, if so, when the deadline is). I got mine over a month ago but I nver activated it (I've still been using my Treo 700p as my daily phone). In my first week or so of owning it I loaded a couple of iPhone-clone apps and was semi-happy with the potential of finger-friendly usability. Recently I had some car problems combined with being really busy at work, so the 6800 sat on a shelf for a while.
Now I've got a new car and I want to hook up something to the stereo and have GPS, MP3, and speakerphone functionality. I got my wife a Motorola T305 Bluetooth speakerphone gadget and have been happy with the sound quality (but it sometimes doesn't connect - a problem likely more due to the 650 and 700p than the Motorola T305).
Although I've got a separate Bluetooth GPS device and own the TomTom software, I see that dedicated GPS units have gotten better and cheaper. There are units from Mio and Harmon Kardon that offer large screens (e.g., 4.3"), MP3 functionality, and (in the case of the Mio) Bluetooth speakerphone functionality, for about $300. I'd love to use my 6800 for those purposes, but the small screen (2.8") will make for more difficult finger-poking while in the car, and I suspect that the speakerphone loudness won't compare to the Motorola T305 (or possibly the Mio GPS unit - I don't know how good the quality of its speakerphone is).
I don't suppose any of you have attempted to use the 6800 for the purposes I've described? If so, please post your experiences.