Torque News drove the iA and really liked the seats. They're not bolstered enough for hot laps at Laguna but they're more then supportive and comfortable for your day to day donut runs.
http://www.torquenews.com/1080/2016-scion-ia-game-changing-new-subcompact#.VZU9bJ-_Iq8.twitterThe sport bucket seats of the iA are well-tailored and offer good support and comfort, though hard sport driving will prove the bolsters inadequate for Speed Racer types. In everyday driving, though, the Scion iA is a comfortable, well-mannered little car that is equally at home rushing from one stop light to the next as it is twisting through the seaboard roads of the coast.