Doctor I know that road, not that far from us. Would definitely not choose it if trying to get anywhere in a hurry! Too many cars trying to go up and down and not enough passing space! Problem with sat navs in general I guess...
DH had success with TT today. It pulled in live traffic, re-routed him on A roads when needed and no time was lost on a 5 hour journey. Thankfully for me, it meant that he was home in time to give DS a bath 
A few thoughts we've both had:
When you select colours, whilst the icons show you the choices, it doesn't show (as previous TomToms did) a little thumbnail of how the map changes as a result. Just makes the process a little laborious as some theme colours don't quite work for our old eyes.
For us they don't work because the theme colours don't differ enough from the route colour thereby making it hard to visually distinguish them from each other. The road and route colours are too similar. Having a thumbnail would just stop you from having to go back to the menu each time it doesn't work.
Voice commands work well, even with the radio on which is a positive because the menu button on the touch screen really is far too small. Perhaps tapping the screen anywhere would be more user friendly with a big exit button in case it's done accidentally?
3D map works really well and looks good. We like how as you are exiting a motorway junction it kind of represents what you are seeing. Obviously not exactly what you are seeing but shows a built up area or wooded area. A nice touch.
However, we think there may be a bug when trying to switch between 2D and 3D views when using VR? There seems to be three different views. A 3D view, 2D version of the same and then Serena's 'special' 2D view.
When you use the voice command to switch between the views, it selects the 3D version fine but when 2D is requested, it doesn't go to the standard 2D version that shows when you manually select it. Instead, it pans out and shows the route summary. It doesn't change. It then needs manual override from the main menu. Perhaps it has the wrong command assigned to it?
Enjoying getting to know TomTom, must update this weekend - my laptop keeps reminding me, which is useful as otherwise it would end up waaay behind!