Skimmed the site and saw:

"FOR THE WEB, BY THE WEB"

"Brackets is built using HTML, CSS and JavaScript. If you can code in Brackets, you can code on Brackets."

"WORKS WITH YOUR BROWSER"

Spent 5 seconds skimming the page up and down for a "Try It" or "Get Started" link, but only found "Check It Out". After 3 seconds of reading, I re-interpreted "Check-Out" as in the source code sense. Re-scanned the page, no other obvious demo headings, so I closed the tab.

Despite the page's high level of visual polish, it completely failed at explaining to me what the app was and how I should go about getting it.