I like it, but have only used it for a few posts from my phone so far-
https://alpha.steepshot.io/@jctdesign

It is a lot like Instagram, so good for those types of shares (photos with minimal text). Steepshot does take a small percentage of the rewards for the post, so that is something to consider. The post is visible in Steemit and on the Steepshot app though, so you get a bit more exposure. They also allow you to use more than 5 hashtags, which is nice. I am using it on Android, so I don't know about the Iphone version. I would imagine that the interface is similar though, and I do think it is visually pleasing and easy to use.