You said that old VC-RE70/72 was not able to climb on carpets. Take a look at this: viewtopic.php?f=6&t=12472&p=77346#p77346
No i haven't said that it is unable to climb all carpets, but i said it is unable to climb high carpets.

The VC72 can't climb on the carpet around my couch. And it is also unable to clean on soft carpets.
Also it couldn't climb the carpet in the living room of a friend.
When it cross the carpet not at 90 degree but for example 45 degree, the VC72 has often Problems.
It climbs not straight and looses the correct direction.
The low and middle carpets with not soft fiber in the video it will mostly climb.
Like you can see, the carpet in the kids room is the border for this robot.
Higher carpets and higher doorsill are to much for this robot, especially when it didn't cross it
with a angle of 90 Degrees. At this point the Tango is much better !
If in the future you will have the possibility to compare both models, you will know what i mean.
Bernd