I was sceptical about this product - I've seen and heard of them but couldn't believe they would do what they claim. How wrong was I! Absolutely brilliant, the flow from the shower head is dramatically increased but not to the point that it's unbearable. All the settings on the shower head are easy to change and distinguish from one another and each one is a complete change from the last. The pressure is increased via the head so you don't need to turn the shower on full so you can see for yourself that you are using less water.
All in all this is an amazing product that does exactly what it promises to do. Can't recommend this enough!