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I've got about 6k mi on my 660 and have had no problems with what I use it for. As previously stated, it's not bug free, nor will it ever be. For a great place to talk 660 issues check out zumoforums.com. It's the definitive Zumo site.
zumoforums.com has a running bug list and wish list going.
The lack of map detail and the redrawing of routes that you made using MapSource are two bugs that I would like to see fixed. The latest firmware fix did not address these two problems.