Not a whole lot of external changes, but plenty of usability adjustments.
Motorola's spotty history with updates clearly doesn't apply to their watches, as their entire line are among the first to get Google's latest version of Android Wear and all of the features that go along with that. We already know about the new gestures that are available on the watch, and permissions on the wrist are the kind of thing you either accept or can't stand. There's a lot more to an update like this, though, and the best way to get a feel for how that update is working out for everyone to to ask directly.
So, Moto 360 owners, this one's for you. Our Moto forums have been buzzing with individual experiences, but a group voice is required here. Is Marshmallow on the aging hardware that powers the original Moto 360 a little too much? Have you noticed better battery life on your second generation Moto 360? Do the new gestures offer any increase in day-to-day functionality? There are plenty of folks out there waiting for Marshmallow to hit their wrists, so do your part and share your experiences in the comments below!