I have steel-toed paddock boots and ride in them too sometimes (with half chaps). I have sung their praise many a time, and again now, working with a baby!
Yes, the crush your feet is a myth. I had my older brother drive over my toes in a freaking CAR (A smaller Renault) and nothing happened.
But you should see to that they are certified and look up what the certificates mean. In germany I look for "Tüv".

Basse, 198?-15/9/2008