If your not sure, don't go for them. They do not provide strong results for Kickstarters anymore. If you use it it is because you have the money and the campaign working. If you don't keep up with FB ads. I had a very bad experience with them last year and wolt not recomend their service to anyone.
Krowdster is a scam, their database is far from being up to date and it works like this : If a person has tipped over 50 project in "Games" but only one in "Tech", they will appear in both filters as 50+ backers. Some accounts doen't even exist anyway, and building and audiance f...
To do so I suggest that you go to your project's board and create a custom tag. Use it for your ads, it will be easier to track from analytics and Kickstarter will give you some stats about how much it converted.
Thank you for the post. We are launching our first Kickstarter campaign but getting people's attention can be hard or expensive. We will try reaching creators to have constructive discussion and see if it works.