Probably ought to give it 5 stars, but haven't had it that long -- gotta see how it fares after a few years.  So far, works great.  Dog has plenty of traction, ramp is plenty stable.  Not too heavy to move occasionally, like to mow the lawn. As I saw other reviewers note, it is easy and pretty painful to pinch your fingers when folding it up.  Excellent for any human or animal weighing up to about 160 pounds.