I liked the fact that I could promote my items on my social networks while being able to take time off at the same time. I didn't have to be online to promote. Anything to save time is a blessing for my business!
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.
I mostly liked the sale tool, where I put my whole shop on sale. I found it easier to use and more accurate then the EtsyOnSale app I tried once before. This is also a better value for the money I think, and it does Facebook, Twitter and Pinterest posting, which I pay another app for as well. I am probably going to cancel the EtsyFu service and just use this since it works just as well and its all in one service with the sale app and the analytics feature is very nice. It is pretty much multiple existing Etsy apps all rolled into one with a nice easy to use interface.