Alfred 2: Rewritten From The Ground Up, Workflows, Themes, and More
www.macstories.net/reviews/alfred-2-rewritten-from-the-ground-up-workflows-themes-and-more
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
Alfred 2 doesnt feel like an incremental upgrade to the original app. I think it could be better described as a fresh start. Rebuilt from the ground up, Alfred 2 sports a more logical preference structure that has been simplified for easy navigation without losing any features from version 1. Most notably, the developers replaced extensions with more powerful workflows. The user interface is larger, cleaner, and has new Retina-ready icons.