Well IMHO you've provided an excellent overview of the RX-5 and certainly touched on every aspect that I was interested in (GS-911 scan to follow....).I don't think there is a way (or at least I haven't found it yet) to "switch" the wonderwheel between the two devices so it solely operates one of them. As of now, I'm using the wonderwheel left and right clicks for the Koso, and on the Nav VI I use the wheel to zoom in and out (or other features using the wheel's spin; spinning has no utility or effect on the Koso). When my use on the Koso changes the screen on the Nav VI, I just use the Nav VI's touchscreen to go back to the screen I want. It hasn't been annoying for me.
If I discover anything amazing or problematic, I'll post, but otherwise I think this is my final word on the Koso RX-5: Better than Cats - I'd see it again and again!😉
- I like the visual aspect of the Koso better than the stock instrument cluster - not surprisingly, it's just easier to see the information and I can have all of the relevant information on one screen.
- The layout of information is good and the look is easy on the eyes - i.e., I feel like the colors are comfortable and the switch from day to night colors is effective.
- I find it much easier to access my music and phone calls through the Koso unit (vs. the Nav VI as I was doing without the Koso).
- I don't care for the nav feature in the Koso. It only provides the next turn info. I prefer the full map and traffic information from the Nav VI. Also, it's pulling from the phone, so it is another draw on the phone battery.
- At the end of the day, my initial opinion hasn't changed after a few days'/rides' use: it is an excellent unit that doesn't add a lot of functionality (except the nav); it just does everything better and is a better user interface for those functions/features (other than nav).
- I wouldn't get the Koso to eliminate use of the Nav VI, but others might be fine with the limited nature of its nav function. I think it's a no-brainer as a replacement if you have to replace your stock non-TFT instrument cluster. Whether it's worth the money if you just want to switch is obviously a personal decision. As I've said, it's worth it to me.
Edit: I lied - I'll check for faults today and update with that info.
Like you, I use my GPS/Zumo XT for all navigation and have never connected my phone to my old Nav VI or previous GPS as I use the Cardo unit (Packtalk Edge now). My personal wants are a device that's easier to see and has information on the main screen that's relevant so in my case it appears to be a winner.