Have parallel a cheap product ordered (JJC White Balance Cap, about 5 euros) with very clear result: The cost product is really cheap, that is not to be used (mainly because of the permanent blue cast), while the product of the nearly ten times the price just fun: keep away from the lens, make manual white balance, shoot - and be happy about the result. Then work to compare with ABW and other presets - and even more pleased about the wise investment. The price is a little daunting first, but actually obtained a certified and most of all easy to handle and efficient quality product.