The Insight's front seats are a little short and flat, but they're covered with a nice, meshy fabric that's grippy and comfortable and there's plenty of headroom. Unfortunately, behind the front seats, it's not quite as perfect; the backseat can fit three kids across, or two adults, but headroom is very tight due to the sloping roofline.
Cargo space isn't quite as good as it looks; there's a generous 15.9 cubic feet, but it's quite shallow, and the 60/40-split backseats don't quite fold forward flat.
Interior appointments in the Insight are about on par with those in Honda's other small cars—which is to say, there aren't a lot of soft-touch surfaces, but it feels tightly assembled and the dash and doors have nicely grained plastics. Ride quality is good despite the short 100-inch wheelbase, and the interior is quiet and civilized except when mashing the throttle to the floor, which causes the engine to become quite raucous.