First of all, we have to remember that the key of time was found on the shelves when Hublot adquired BNB.
This watch is a re-design of the watch which was previously presented by La Confrérie Horlogère:

Aesthetically speaking, the Hublot version is a great improvement.
But to be frank with you, I don't understand the point of this watch.
To accelerate or slow down the flow of time... first of all, the other person has also a watch and this change of pace needs time to become "visible". The complication is not fun at at least the Temps Suspendu by Hermes is much more enjoyable because it is instantaneous.
A watch which is not really beautiful, not enjoyable, not fun.
Thanks for your presentation.
Fx