Interesting to read the issues you're all having. Good to know I'm not alone. I've just written to Toyota CEO and Lexus MD to make sure the issue is being heard at the highest level.
My biggest issue is the dreadful echo heard by the other party on a Bluetooth connected call by iPhone 5. I now can't use my phone in the car. Anyone got any fixes for this?
I made the point to the CEO that the £18k Renault Clio I've just hired whilst on business had a significantly better nav / phone system ...