I think squeak already covered a similar response like yours. Maybe its not the best to everyone's ear, but the 13W7 IS the best at putting out the most clean bass. You may not like it as much as other subs, but it has the most linear excursion over anything in the market.
Not only does it have the most linear excursion, it has a super suspension, super cooling, and many other extras that smaller companies just wouldn't even have the funds to design.
So to sum it up, you may not like it the most... but if you actually test whats being produced from all the subs out there, the 13W7 will be the MOST accurate... so in terms of being the most sonically accurate out there (SQL)... it IS the BEST.