Interesting, evidently out of the loop and didn't see the 660 had been replaced.
As slofox said, maps, I use NZ Open GPS project (compatible with Garmin) and it's way more accurate than Garmin (partially because I've submitted corrections, plus all the other enthusiasts). Bit of a killer that this new range forces you to use Basecamp. I've tried switching but found it hard to use, so opted for the easy route and continue to use Mapsource.
First GPS was a Zumo 550, did about 100,000km with it. It's still floating around somewhere, with a new screen I (still) haven't fitted, as the original got quite worn. Currently using a Zumo 660, it's probably had a harder life with more adventure riding, probably done around 30k? with it? Would have to check. I use wired comms and bluetooth comms, both work fine, fine in torrential rain etc. Using bluetooth, it's for directions, music and controlling my mobile (so pretty much full functionality)
The improvement in performance would certainly be valued, screen size, Ok, bigger would be nice (just have to make sure there is space), but otherwise, doesn't seem to be anything I need from the new one. 660 works for me.
I would suggest wiring to bike via an ignition live circuit. GPS fires up as the bike goes live, when I shut the bike down at a gas stop or similar the power feed is stopped but it switches over to battery immediately (and prompts with a 30sec countdown to continue on battery or turn off). Once bike power resumes it uses that and charges the battery. I don't need the GPS for daily riding/commuting, but I've done a lot of route planning across the country with it... found some really nice roads confident that I can never really get lost... just end up someplace I didn't plan to be

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