Feedback is one of those things that is vital for the organiser but tedious for the attendee.
In the past I've used QuestionPro and included the link to the survey in an email with the link to the presentations and content from the conference. This worked well however after a while I noticed it was the same people over and over again.
In my current role, I personally do not deal with delegate feedback however I know that we use Survey Monkey which is extremely user friendly and delegates have a positive reaction to it.
I think the process of collecting feedback at events needs to be more interactive and straight to the point, has anyone implemented an interactive way of gaining feedback at their event(s), I'd love to know what was done and the reaction it got.