User Submitted Posts enables your visitors to submit posts and images from anywhere on your site.
I've been using Community News before this but was looking for a plugin that did the same yet added to categories as Community News doesn't. Therefore none of the posts can be SEO'd or used with Jetpack pubicize.
On the face of it this had loads of potential but failed in these areas:
1: Image doesn't upload
2: no way to capture email address
3: Styling is questionable
Without those features, it's up there with a chocolate fire guard and nigh on useless. If those were included, I would pay for it. The redirect is great, the category posting is great. However, it doesn't work as it should.
Shame as it could be blinding and tick a load of boxes.