I love the text-to-speech function. For me, the best voice is the female Australian accent. I find both male and female American English voices too "computer" or robotic sounding for me. I get a laugh at hearing it pronounce some of the Spanish streets. It's so "gringo" LOL. But for Hawaii folks, text to speech is pointless because 99% of the streets are mispronounced
Now, if only someone can find a way to hack the 660 and make it a 680 (pretty much the same unit except with MSN Direct)