gsheen - you are spot on there and I was just about to say what you've said. As a paying member of Which since 2007 or 2009, I ended my subscription for their love of Miele and nothing else - example looking at the postings Beko has supplied here ;
The Miele S6 Ecoline and the Miele S6290 Silence are exactly the same save for the body colour. How can the S6290 be rated 5 stars for noise and 4 stars for the Ecoline when they both have the same 1200 watt motor? I looked at both (and trialled) at John Lewis when I bought my Ecoline and the Silence model is exactly the same on noise. Also, how can the S6 Cat and Dog have poorer performance using the standard turbo brush on carpets against the suction only floor tools that get 5 stars on carpet performance on other Miele models? Something doesn't add up!
Steve - the reason, or rather Which's poor reason for not testing the K series is because they feel there isn't much of a demand for the K series, hence why they don't test it any more. As for the X series, they used to have test results for the X1 Automatic way back in the 1990s and forever lauded it as being one of the best vacs on the market - Which haven't done much with the current X series since then, although last I looked on Which's other forum, there were quite a few owners who rightly wrote review comments on the info Which had supplied, as well as quite a few owners who were shocked to see the Numatic Henry as a "Don't Buy" in one of the past issues. Which do get it wrong sometimes, but to the consumer who doesn't know much about vacuums, it's a kick in the teeth for owners sometimes.