Either way, that specification sets out a certain level of performance in ice and snow, measured by various tests providing numerical results. Some tires will barely meet them, others will exceed them by a wide margin.
I've found the Nokian WRs to be very pricey, and suspect the Yokos will be too. My current plans for the Golf, which now sees limited city use, is to wear/age out the OEM Good-Years in the summer, likely summer '09 being the last summer (unless I have an irreparable puncture on one before then), then wear/age out the Blizzak WS-50 set I have using them year-round, likely up to the fall of '11 or fall of '12. Assuming no major changes to the tire offerings from now to then, I plan on replacing both sets at that point with a set of Hankook Ice-Bear W300s, to be used year-round. Much more reasonably priced! I've heard of others doing that with H and higher rated winters, since essentially, the Nokian WRs and the Yokos are high speed winter tires marketed as all-weather.