That seem to be self proclaimed expert consumer review. Some catagories like best under $300, $2000 and "money can buy" catagories are by professionals. The overall catagory (along with some others) are just by hobbyist. You even have catagories with one entry, so either the so called expert thinks that one sub is head and shoulders above the rest or that person has limited exposure to different subs.
Even the expert reviewer seem to have completely different list of subwoofers from their March 2009 list. I don't know what that could mean, but for all 5 top subs to disappear from the list and replaced by 5 completely different subs, either new ones are leapfrogging the old ones so fast or there is some other reasons.