Driving to downtown Seattle last night, the most difficult part of the drive was the 1 block from my driveway through my cul-de-sac to the road that had been plowed. There hadn't been much movement on the street, so there was about 8" of snow accumulated. I heard some snow rubbing on the underside of the car, but the car behaved well. Where the plow had piled up snow was higher, but I just had to bust through.
I did get a more serious error message showing up on the screen - saying to go have the dealer check out the road mitigation, lane check and braking - all of the same systems that indicate the radar was blocked - but wiping away all of the snow off of the plastic area under the hoodline *and* the bottom air dam seemed to make the error go away.
In general the Insight handles well in snow/ice - but I have to think that much of it is due to the Bridgestone Blizzak WS80 studless snow tires. No slipping, no sliding - driving past the parked cars on the side of the hills that likely have all season tires, but no traction.