I only needed this section of the gate, so I can’t comment on it as an extension.  It feels pretty solid, and it has little rubber feet which I like.  The height and width work for me to block a swinging door.  I thought the price was very reasonable compared to  others I had seen on different sites.  The reason I only gave it 4 stars is because the color was listed as walnut but it is actually more of a cherry.