I have had a few GPS units the last 6 or so years, and am now shopping for another one with better performance and features, does anyone have any experience with the Sony XNV-770BT?

It seems to have all the features including integrated Blue tooth etc. I currently have an eclipse Sirius SAT and will be using the ipod/iphone feature. I think the Sony will control the Eclipse Sirius and display all fields but not sure.

My current Sirius loses SAT position all the time, as in 10-20 miles away and wrong direction. Even if I manually adjust, it loses its way with a few minutes, It *might* update in an hour or so, but this is completely unsat. I had an older pioneer but didn't like the interface or the SAT tuner.