I know that Navigon is generally accepted as being the most accessible of the GPS apps (at least the ones that provide full routing features), but I do find it has a tendency to take us down some strange routes (particularly in more rural areas).
I've tried Skobbler and VoxTrek, and thought they were both quite basic.
That leaves CoPilot and TomTom as full-featured navigation apps. Both are quite pricey. Has anybody tried either of these? I've seen TomTom mentioned as being accessible, albeit not as much as Navigon. Does anybody have any experience of using the UK version? If so, how well does it perform? As for CoPilot, I don't recall ever seeing a mention of its accessibility. Has anybody tried it?