Yes the 2016 media system has so many options it makes Carista modding redundant on the top spec Toledo and Rapid.
I cant get on with the newer Satnav graphics though, and on the Leon the colour screen in place of the maxidot just irritated me the whole time.
I've not use the nav function 'in anger' yet, just had a play with it. I don't particularly like the graphics either, but that may just be because I am used to my Tomtom. On balance, and despite the fact that using the Tomtom isn't as neat and tidy, I think that the TT is likely to remain the preferred nav tool - because, in no particular order:
my TT comes with free maps for life whilst I suspect that updating the built in system will be expensive;
the TT, when stuck on the windscreen, is line-of-sight which I prefer to having to look down to the media nav screen (I think that the turn-by-turn directions can be viewed on the maxidot - not played with that yet - but that isn't line-of sight either);
my TT has full postcode search and the ability to select waypoints to customise a route - both of which I use - whereas, if the built-in system has these features, I haven't found them yet (which is quite possible - I'd be happy to be corrected if they are actually there);
I can set up the TT in advance, indoors.
I'm not suggesting that the TT is brilliant. It's quite primitive in some ways, e.g. the resisitive touch-screen. I just find it, generally, fit for purpose - up to date and as easy to see as looking in the mirror.