So far, so good!  Our 90 pound old english sheepdog learned to use this in one day, although she is still tentative going up it.  I like the fact that it telescopes.  It fits nicely into our smaller size SUV.  There were scratches on it from her claws after the first use, but I don't think that can be helped.  The surface is somewhat rough as some people have mentioned but I think that is necessary to prevent dogs sliding down it.  (can't understand the comments about it cutting dog's paws or human hands as it is not THAT rough)