Hi Geo K -Would be interested in links to the sites you used.
In addition to Tire Rack (who may be biased as they sell the tires - but they really liked these tires) I checked Consumer Reports, Auto Gild (Germany), Tire Reviews and More.com, of course Vredestein's website (shockingly they really like them!! ), and several youtube reviews which were mixed...
You can find sites that love them, as well as sites that don't really like them.... Consumer Reports being as unbiased as possible liked them enough to seal the deal for me.
The overall combination of quieter ride, more comfortable ride, plus handling characteristics from the various sites, plus price, is what did it for me.
Remember, my driving may be very different than yours, so my tire expectations may be different... for example, my main objective was to find a tire that had a very quiet ride, but I liked that the Vredesteins were well rated in snow handling. I don't drive much in the snow these days (I live in New Jersey, we had 18" of snow Sun - Tues of this week) because I choose not to, and don't have to... I spent my formative driving years in Buffalo, NY so I learned early about driving in snow. I don't trust other drivers not to drive like it is a sunny dry day when it is snowing - I see crazy driving all the time - so if I don't have to go out until the roads are decently cleared, I don't.
Wet weather (ie rain) was also important because I had a set of Bridgestones (original stock tires) on my RX7 - they would slide all over the place in any rain conditions - frighteningly so. I eventually replaced them with a set of Yokahamas on which I could double the off-ramp clover speeds in any rain condition and it was like driving on dry pavement.
So - research, a site like our MB Forum that provides experienced feedback on similar vehicles, and sometimes just gut instinct need to be factored in with your personal requirements.
Sorry for the long response, but it wouldn't have been fair to just say "I looked at CR and that was what made my decision for me"