The Dayan GuHong V4 is the successor to the V3 and, like its predecessor, an extremely smooth and quiet cube. The box contains a storage bag and a screwdriver. The cube is very light.
The cube is very fast out of the box, you may need to increase the tension a little using the screwdriver for better control, but that depends on your own preference. The corner-cutting is a lot better than with the V3.