I really like how easy it is to exclude the listings that I don't wish to view or favorite. And then view or favorite those listings I chose to do at a click of a button! Super easy to do on my Android phone too! And it's free! I can launch an item in my shop as long as I have the appropriate amount of credits.
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.
That's amazing how easy you can select which products/categories you want to promote on what social media and at what time! This is great as it allows me to concentrate on designing/making rather than spending twice as long promoting the products.