The DaYan GuHong Pro M is a great value magnetic 3x3 speedcube from DaYan, one of the best known speedcubing brands, it features a ball-core which improves the stability of the cube by having extra magnets between the core and corners. The cube features 5 hand-adjustable tension settings with 1 being the fastest with the best corner-cutting and 5 being more robust with less corner-cutting, the cube has been released in a total of 6 versions, 3 different sizes of 54mm, 55mm and 56mm, each available with regular springs or with repelling magnets (known as maglev) instead, maglev allows the cube to be faster but often less controllable.
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After having this cube for a few weeks I gave this cube a 3/5 because it’s a very smooth and stable cube, but it’s very fast out the box and needs slowing down, I would normally fix by tightening the compression and loosing the screw depth and adding some slower lube, however with this cube having relatively tight fixed tensions when you tighten the compression you get a cube that is a lot more stable but for me locks up a lot more. I also noticed when the compression was at its tightest the system seems to bottom out rather than relying on the spring/ maglev to keep tension. I think this cube would have benefited from either having looser stock tensions or the ability to loosen them like all other cubes, that way I would have loosed the screw depth but tightened the compression, I think that would have made this an almost perfect beginner cube that has the potential to be someone’s main. Also as a side note I noticed the edges of the cube are a lot more squared off and blunt like old style cubes, I think they could have done with being rounded off a bit more which would have given the puzzle a nicer feel. Overall I still like this cube for a different smooth, fast and stable feel but it hasn’t replaced my Moyu V9 BC as a main, the magnet strength is also a light to medium feel however the ball core adds a decent amount of auto alignment which is a nice touch(I did have a magnet come loose but this was easy enough to glue back in), I would also recommend this to beginners if they want to try a smooth cube with a ball core and the 55mm is a good middle ground to see what size cube you prefer.