How does the Park Assist feature work in the Audi A1?

I've heard that the Audi A1 has a Park Assist feature. Can you provide more details on how it works and if it's reliable?

The Audi A1's Park Assist uses ultrasonic sensors to detect and measure the distance of objects around the vehicle. It can help with parallel parking and backing into tight spaces. It's quite reliable in detecting objects, but always remember to check your surroundings yourself.