This reminds me so much of the mp3 player market before October 2001:
Worse, the screen updates fairly slowly — maybe one frame a second. … Over the weekend, I missed a turnoff because the screen showed that I hadn’t reached it yet. Oops.
Like most modern cars’ ambitious electronics systems, this one requires some learning and some studying of the incredibly wretched user manual. There are plenty of typical car-company baffling interface decisions and error messages.
This in the midst of an otherwise glowing review of the new Toyota Prius V in today’s New York Times: http://pogue.blogs.nytimes.com/2012/05/03/the-prius-v-and-its-entune-system
In other words, it’s cool, and it sort of works, but it’s not insanely great.