I've never heard of the brand OSMO before but I'm a sucker for trying different hair masks and products so the price tag of £3.99 lured me in. It's a very thick hair mask and you only need a little. The back directs you to put through hair after shampooing and leave for 1 minute. I actually find this does nothing more than your everyday conditioner. However I prefer to run this through the ends of my hair, put my hair in a top knot and leave it overnight. When washing it out the next day my hair really reaps the benefits from this argan oil hair mask. It's softer and more manageable. I also find the thick consistency of the mask means it doesn't transfer onto my pillows like some of the thinner hair masks I've tried to use overnight. Over all I really enjoyed using this and would definitely consider repurchasing it again for the price tag.