Hi all, My mum was keen to buy this [[http://www.amazon.co.uk/Philips-Sonicare-HX8211-02-Rechargeable/dp/B00DBCHBUG/ref=sr_1_2?ie=UTF8&qid=1379746041&sr=8-2&keywords=philips+sonicare+airfloss]], but the negative reviews are putting us off.... Has anyone used this and had a good experience ? TIA :)