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 especially like the promotion tools which has easy schedule set up with all options I need. Saving a LOT of time on a daily basis! Keyword and trend tools give information to think about and to improve the tags and titles, really helpful. And since this is dynamic, you can stay tuned to the changes in the area of your interest with no waste of time for search it in other way.