The GAN 13 MAGLEV UV Coated is the most expensive major 3x3x3 release, it is already used by many top speedcubers but the question is whether it is worth the price, that can't really be answered definitively, it will vary from cuber to cuber and also depends on your willingness to practice regardless of what speedcube you choose to compete and practice with. The gan 13 is not ridiculously fast out of the box but is still quite fast, the edge-core magnets actually repel so it is very unlikely to ever not align correctly, testing corner cutting is actually quite difficult. The UV Coated version features a shiny, UV coated exterior which reduces scratches and makes the cube feel different.

You can buy it here