The Valk 5M is a very stable puzzle, with a crunchy turning when set up. The cube is very fast, but not uncontrollable, and haven't many problems with lockups. By *much* I mean, that the cube will occasionally lock up and fixing it back will take a good few seconds, the corner gets stuck. Apart from this no other flaws, and this may be from my loose tensions. The corner-cutting is on par- maybe even better than current cubes and I haven't experienced any corner twists. (as if they occur on bigger nxn's), The shades on the Stickerless Valk5M are very bright, and distinguishable, and contrast very well with each other. Overall this is an amazing cube by Qiyi, definitely an upgrade to the Valk5, and if you are into 5x5 definitely consider purchasing this puzzle.