Proper link:
https://www0.epinions.com/review/Garmin_zum...nt_473572675204
While the main body of the article was indeed written when the unit was released, it has been hugely updated regularly (most recently with the release of the last version 3.80 in late June), which has a full review therein . . . 3.90 aparently cleared up the shutdowns that have been appearing with increasing frequency in the model and nothing else. There is now reporting of a new (but unreleased) version 4.0 - available in new units, but not for download yet.
The unit does NOT justify the premium price attached to it and if I had to pay for my navigators, I would not be buying a Zumo 660 or 665 - but probably would be adapting the last of the decent Nuvis (the 760/770/780) or a Zumo 550.
I managed to get myself banned from the Zumoforums board for trying to explain that all of the nav features (and many of the premium ones) could be had for less than $300, leaving the buyer with sufficient spare change to hire a first class hooker and have a great time - that opinion remains.
Unfortunately, I will not likely be doing any more riding this season for medical reasons, so I won't be able to check out the 3.90 (and probable 4.00) firmware version as it works in the MC cradle.
However my opinion remains that the Zumo 660/665 was NOT designed by riders for riders,
but rather by corporate dweebs who like to use Garmin's customers as it's unpaid testing panel.