I like that customers can self categorise the reasons for happiness or unhappiness - makes it easier for the support team to take ownership over a customers potential issue.

The drag and drop interface makes it very easy to use. We used to use Google Surveys but the interface was horrible which made it take longer for us to design and deploy surveys. Delighted is awesome in that regard because custom surveys are easy to put together, and there are a lot of templates available as well.

Easy to use, and allows you to segment your follow-ups based on a user's NPS response. Slack integration makes it easy to share feedback with the team.