I like how Seller Tools has saved me time! Before, I never posted things to Twitter, Facebook, or Flickr, because I just didn't have the extra time! Since using Seller Tools, I have seen traffic to my store double, if not triple!
I love the simplicity of scheduling posts. I had been trying to keep up with that myself, and some days (like the last four) were so crazy I wouldn't post at all. Scheduling sales events is super simple as well, and you make the graphic for me, which was fantastic! Having the red text draws the eye, and really stands out. I have yet to try Favathons, but I'm working on Clickathons a little bit several times a day. I have already seen results in traffic to my shop!