This cube is absolutely astonishing, Roux solvers will love it when corner/edge is at minus strength, which allows super easy MU moves.
If you like fast cubes, you won't be disappointed with this bad boy, even with all setting to fast n slack the cube is still perfectly stable (1,1,-).
My main was the WRM v9 BC UV, as a comparison, the only thing that I wish the wrm had was adjustable corner/edge like this cube, thats the winning feature of the V4.