Folks whose apps are already in the store sound quite pleased. The Mac App Store is another form of advertising, said Greg Scown, co-founder of . Smile’s PDFpen, PDFpenPro, and DiscLabel are all available in the store. Of course, Smile’s flagship TextExpander hasn’t yet made its way into the store—though not for lack of trying. Scown noted that the app is “in review” with the App Store’s moderators, and that Smile has gone “a few rounds” thus far, trying to get the app approved. Scown said that he has every reason to believe that, eventually, TextExpander will too appear in the Mac App Store. On the whole, Smile’s feelings on the store are easy to sum up: “We’re thrilled,” he said.

Jim Teece of Envision, makers of Art Authority for the , , and , is really happy to be in the Mac App Store, calling it “absolutely brilliant.” He told that Envision has sold more copies of Art Authority through the Mac App Store in several weeks than in the past year. His booth on the floor has been steadily busy for the whole show, and he’s sent every interested customer straight to the Mac App Store, not even bothering to mention the company’s Website.

We also spoke with Christoph Teschner, software architect at Algoriddim, which makes Djay for the and . Though he wouldn’t talk Mac App Store numbers or even a comparison to pre-store sales, he said Algoriddim is really happy to be in the store.