Varia RearVue 820

There are a few questions I have:

-will it fit old mounts? It’s provided with a new one. 
-will it be possible to disable flashing on the international model like with the 515? I don’t want to buy a STVzO (german) version so I would import one, but I would like to be able to make it compliant if I wish. 

You know what's annoying?  I've been struggling with an old Varia whose battery was showing signs of age, and wouldn't survive longer rides anymore.  I could feel it in my waters that a new model was coming about a year ago.  Just before a cycling event last October, I couldn't wait any longer, and bit the bullet and bought a new one.  If only I waited 3 more months...

Also like this:

Mixed feelings from me.  I like the brighter light, braking function and larger battery.  However, the cost is too much and I don’t think the extra information it provides is useable.  To be useful I would need to be staring at the head unit for longer than is safe.  If Garmin brought out a revised heads up unit that shows the information in your glasses it would make the information valuable.

The brake light function is the least interesting for me because I have owned several taillights with that feature and none of them work the way one think they should. I assume brake light function on the RearVue 820 uses accelerometer like others. My experience is that the brake light does not turned on unless there's a rapid deceleration so most of the time, tapping the brake to slow down does not trigger it. Occasionally, hitting a bump or pothole also causes the brake light to engage. On top of that, because there is no standardized implementation of brake light on bicycle taillights, the person riding/driving behind you most likely won't have a clue the significance of it when brake light ever gets triggered.

Good point and very true.