I loved the fact that Seller Tools helped me out to increase favorites number of my shop items. This lead to a 3 sold items. I also did not have to create coupons to make a sale and the new sale price was set automatically for each product.
I really like the never ending list of tools that is available to me! The weekly reports give insights on what is working and what is ultimately a waste of my time. Most of all, I like the keywords/tags analyzer and how much it helped to get my products that had little to no exposure seen.