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Nah - MIPS is marketing BS defined - a total money-making licensing initiative. Don't get sucked in. If you've got a decent head of hair then the hair and scalp provides all the slip-plane you'll ever need. There's a argument that when you combine MIPS with your natural slip-plane the helmet is able to move too much (leaving areas of your head you'd want covered potentially exposed)...
Worth paying £200 for Z1 with MIPS over £99 for one without?