Boss will sell more pedals in a single day than Sonic Research have ever sold since they started making pedals. And that's no exaggeration. Boss are the market leader (in terms of market share) by a significant margin. The TU-2 has always outsold the Pitchblack. The TU-3 brings it more in-line and will gain sales back from some of the defectors to Korg but I think it's just a update to a popular pedal just as DD-3 became DD-6 became DD-7 - as has already been said, Boss create the market rather than follow it whatever anyone thinks of their pedals. In many cases, Boss is the standard by which others are judged.I dunno about that anymore. While Boss certainly overshadows almost anyone out there in pedal sales, let alone tuner sales, Sonic Research has definitely gotten their name out there recently.
I'm not saying that Boss pedals are better or worse than anyone elses. I'm saying that they have a very dominant market position and, in terms of branding, are the envy of every other mass-market pedal manufacturer.