It seems the analysis of Stardock's public report is far from over. Gamasutra report that Direct2Drive do not agree with the assessment that Impulse is second in the digital distribution market behind Steam. D2D's splendidly-named VP of digital content, Sutton Trout, said the claim was "misinformation at best." Stardock's Brad Wardell responded: "The data we used came from the publishers. When you add in the fact that Sins of a Solar Empire, Demigod, Galactic Civilizations, etc. are sold exclusively on Impulse, that is what allows Impulse to edge third parties."
Hard to know who to believe until we see some sales figures, eh? Transparency could be a good policy, after all.