This is by Doodle, a neat little service for coordination of meetings (no affiliation etc.). Once an invitation is sent out to participants, they get this form.
Specifically, I see two issues with it:
- They changed the functionality of what's probably the single most standard control in the world - a regular checkbox.
- They notify the users of this change in a way that doesn't seem to be very elegant or efficient.
What would be a better way to solve this form?