They sound completely dangerous on dry pavement.
"Handling of the Sock vehicle was almost problem-free, but only within the range ofreasonable speeds..."
"If the steering angle was built up fast and if high lateralacceleration was involved, the considerable differences in the friction values betweenthe front and the rear axle caused the vehicle's rear end to break away in a sudden anduncontrollable manner."
"In cases involving extreme oversteering and in cases involving high lateralaccelerations, the Socks are badly damaged or destroyed (outer wheel in a curve) orthrown off the wheel (inner wheel in a curve)."
"Within the scope of the wear test on the driven rear axle of the Mercedes, a distance of55 km was driven. After the tests, incipient cracks were detected on the Socks, inparticular around the seams"
On ice they showed some moderate benefits over snow tires. On snow the data looks about equal to chains. And on dry pavement they look terrible.
They might be good for someone who's into ice racing.