Immediately reaction - and I can pull down the heuristic about this - when a
form pops up to ask me how I felt about the interface - i accidentally
selected something and voted -
There was no user feedback - and no way to cancel a bad selection. The
ability to get reinforcement from an action, and to escape from a bad one -
or Undo - it a critical human factors flaw in the clickless interface.
Also - there is only one way to navigate and select things. This is very
poor for all non-gestural user navigation interfaces - Kiosks, hand-helds -
etc. I could see an implementation of this working for an iPhone, but not to
retrieve my airline tickets from the kiosk at the airport.
I only had 30 seconds to look at it though... so my opinion isn't even worth