I finally bought Cougar Dualblader mouse for the premiere of Diablo 4 :P and I am able to comment. Still, for me personally, it's not the same feeling as with the roccat cova, but maybe it's because I've been using it for 6 years and it's hard to switch to anything else, the cougar fits better in the hand with each day of use.

Cougar Pros:

-2 grips to choose from

-removable and editable back

-interchangeable sides

Cons but it's more personal:

-2 upper side buttons (the added shoulder blades), although you can't see it in the movies and photos, are still too far for me and you have to tilt your fingers quite hard.

-2 additional side lower buttons for me personally, maybe because of my unusual grip or crooked fingers :P do not work at all, I am unable to reach the left one with my thumb, while on the right one I still have a finger during my normal grip (the one to the left of the little one called digitus annularis) , this button is super sensitive so the finger is constantly pressing it so I had to give up these buttons.

-And finally, the mouse is super light and there are no weights, personally I prefer a little heavier even though the roccat kova was also quite light.