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 really love using Seller Tools, not only for creating sales, but for the treasuries. I think those help my sales more than anything. I've been able to make one very easily and quickly. The best part is the notifications you send out after the treasury is made!