Xtensor, is it any good?

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Hello everyone I was just writing to ask about the Xtensor. Its a sort of bionic hand style glove that fits over your hand, and has elastic bands all over it. The idea is that you open and close your hand, which trains the muscles in your hand. Its suppose to help recovery and prevents on RSI (repetive stress injury) common to gaming, as well as increase reaction time and dexterity for your hands, all of which is supposed to make you a better gamer. The problem is, it costs £40, and i was just wondering if anyone on here has ever used it, to tell me whether or not it is actually worth buying? Thanks