Its 'jack of all trades' capabilities looks impressive to me. Unfortunately our chances of getting this is close to zero but the technology is still impressive.
I think its function would be more 'tank-destroyer' than tank, since the armour will be virtually non-existent. Given the mechanical complexity and russian engineering, maintainence would likely be hell as well. The video is also something like 'Future Weapons'-type propaganda. Still, it would probably be effective in an ambush situation, where it can shoot and scoot.