My final "testing" experience.
Ok, another GPS experience today after the early afternoon garden wait with 8 minutes of "sats in view" and no lock; Early evening I jump in my car to drive across town to my Dad, switch on the Prime, it still has like a micron of Wifi and the second i switch on GPS test, I get a lock on 6 sats. So I think "whoa?!?" and start the navigation, and then start driving. 150 meters down the road, the lock is lost, only to be regained every 30s or so. Occasionally it kept the lock, but the accuracy circle kept pumping like a champ every second. On the way back (general direction north) on the 5 km drive I only got a lock once or twice for a few seconds. Then, however, it was amazingly accurate.
So my sum up for today and this being my final "tests" (as was said:"waste of time") - waited 8 minutes for a lock while standing in the garden with no fix, hopped in my car got an instant fix and it was bearable for navigation, not really dependable on that one drive. On the way back it was unusable.
My next step is to decide how badly I want to use the GPS functions and based on that to return it or not if there is no news til saturday. Because it's still an awesome device... Oh, dang!