It is everything we were looking for, and it doesn't cost us an arm and a leg. It integrates onto our Wordpress website wonderfully, and our donors love it too.
We really like the API with Double the donation for matching gifts. The most helpful thing about GiveButter is the ease of implementation.
The website is clean, modern, and beautiful looking. We love the ease at which people can sign up and donate on Givebutter.
For us it's very, set it and forget it. It's there when we push the link out to our base and in the background when we don't.
Sometimes it was hard to coordinate when there are multiple fundraiser pages for one campaign.
We would instead prefer to have a flat platform fee, but realize this probably means they would make less money. Also, the integration with our CRM was limited in terms of what data migrated where.