Congratulations to the author and a succesful campaign. My favourite part of his post reminded me of a quote my marketing professor once told me "The most important thing in a marketing campaign is a great product" Had desk been a poor product, I doubt the Halo-effect would have happened.
Not only is his promotion on DF and followup blog post a model of How It's Done, but his entire blog is really well-done from a marketing and SEO standpoint. Lots of relevant internal links, good photography, great design, and posts that are devoid of keyword spam and are just the right length and reading level.
Anyway, great design, very savvy marketing and SEO, wrapped around a buggy app that ticks a lot of the currently trendy boxes and contains some shocking deficiencies. And if I sound irritated for being taken, it's because it cost me $30, which is what a mature, quality, premium app like Pixelmator costs.