Yes, I think they fixed the Killer problems on Ubuntu first and pushed their changes upstream. That may be why it works on Debian (It's only been a week.) I can dual boot Ubuntu but for reasons not immediately obvious to me DNS queries were frequently timing out, making web browsing pretty slow.

I think that Debian is getting the firmware updates too, though for the last one it didn't apply so I just booted Ubuntu and it worked w/out issue. (It uses EFI which is another benefit of that.)