I think if you already have the 770.. the expense for the 800 or the 800 air is not worth it.
For the 800 all you'll be getting is a little extra better night image. And that we still have to see how much better. And the 800 air supposedly just has the cloud service.. and thinkware doesn't know how much they're going to be charging for that little upgrade. That's what I was told by one of their reps.
I had just received the 770 when I found out about the 800.. and that's why I order it and returned the 770.. if it had been installed already. I would have kept it.
Oh.. and is not going to be a software upgrade.
According to their agent.. they are 2 different cams.