I have not used it myself but I have a online friend who has. After asking her I have condensed the answer into a few key points. Take it with a grain of salt as I have no personal experience of indiegogo.
- The service is badly moderated, meaning obvious scams are not deleted. This gives the site a bad name.
- Very hard both for uploaders and funders to get hold of support
- The website is very easy to navigate, design your page and link to social media.
- Sometimes uploading a picture or video is buggy and you have to do it many times for your page to get updated.
- Funders seem more open to new/potentially riskier ideas than on kickstarter
- the "featured" page is not curated but updated by a metric, so you are more likely to get featured by uploading a video/picture/posts a day instead of making quality updates to your page
A few good points but the overall impression seems negative.