I don’t think turn-by-turn (what TomTome provides) is the problem. That seems to work like a charm (at least it does for me). I get excellent TomTom-level quality here in Germany, plus the great (best of breed) traffic info from TomTom.
For me, search and POIs are slightly dysfunctional and some labels are out of whack – both of that, however, doesn’t seem to have any impact on my turn-by-turn experience. So I can believe that TomTom is not to blame here.
It also could suggest that the .1 version will be a significant upgrade if the underlying date's good but it's being parsed wrong/deprioritized for OSM data/etc.
Better than if the underlying data is wrong, anyway.
For me, search and POIs are slightly dysfunctional and some labels are out of whack – both of that, however, doesn’t seem to have any impact on my turn-by-turn experience. So I can believe that TomTom is not to blame here.