What is the most useful for me is that I can schedule posts for my shop throughout the day. Even if I was sitting at my computer all day long, I wouldn't be able to keep posting for different time zones worldwide.
I really like the fact that there is so much information here. I have really learned a lot about how to market my Etsy site. The sale I have going is really helping my sales and my brand name is being recognized. The hourly postings to FB, Pinterest and Twitter are such a time saver for me. You also have great "help". The person I talked to answered all of my questions perfectly and even gave me more "tips" on how to promote my site.