Just seen this [[http://www.johnlewis.com/clinique-sonic-system-purifying-cleansing-brush-with-free-30ml-liquid-facial-soap-and-clinique-headband/p233856073 clinique brush]] advertised, I wonder how it compares to the Clarisonic? (which I've not bought, too expensive for me). This is quite tempting given the price... What do you think?