I love the ease of promoting items in my shop through social media. I love that I can set automated promos as well as manual, because I can promote new listings easily manually and promote my existing listings with the automated version.
I tested it by using it, then not using it. The "not" using it was hard. I found it much easier to schedule the posts, then forget about them. I did wish that I could have put more specific information for Etsy teams on Twitter so they would be caught by them better. but the pictures worked extremely well. I found I expanded my target audience using the system, and sold more, which is the bottom line.