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I'd say nav is a personal preference, I don't think you'd miss it if you didn't have it. But if you have it you would probably wonder how you'd live without it :P
I've got the older CCC iDrive which looks pretty Windows 95 like (pretty crappy interface), but its still handy for scrolling through your music on the USB drive and also the occasional navigation.
My previous 1er didn't have navigation at all and it was annoying to try and navigate through the music. Its also worth noting that some of the displays on the headunits without nav suffer when it gets hot (the text disappears from the display completely and doesn't come back until its cooled down). I'm pretty sure there are threads on the forums about it. Never really saw it mentioned in the Aussie forums but mine suffered from it!
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