WE LOVED THE STAIRS FOR OUR DOG (WHO HAS CATARACTS) AS IT HAS SIDING ON IT TO HELP WITH HIS MANOUEVERING UP AND DOWN.  THE TREADS WORK WELL.  THE ONLY THING WE WERE DISAPPOINTED IN WAS THE TREADS FOR THE FEET.  WE THOUGHT WE DIDN'T GET THEM AS THEY WERE SO SMALL IN THE PACKAGE, 4 LITTLE TINY ROUND STICKERS.  WE SURE WOULD'VE EXPECTED MUCH LARGER AS THE STAIRS WEREN'T CHEAP.  THAT IS WHY THE 4 STAR..OTHER THAN THAT, IT WOULD'VE BEEN 5