I am very happy with my purchase. My only complaint is I still find it a little hard to collapse, however I think it is just a matter of finding the right angle to push down on. I like the larger size for my 15 pound Shih Tzu as he is able to lay down and stretch easily.  He is older and would not go on walks easily.  Now I get my exercise and when he gets tired I put him in the stroller and continue my walks.