Bought this step unit for my senior cat to help her navigate to window seat. Perfect height, especially from step to step. Most climbing units with levels are too steep and crazy expensive. Pet stores sell cheap, weak and poorly constructed step units. These are perfect. Very easy to assemble after I figured out the picture instructions; this assembles similarly to furniture from IKEA with everything included, pre-drilled holes to align and took about 15 minutes. For someone with more dexterity, it will take less time. Looks great, sturdy, tidy and fits into corner next to window seat perfectly. My cat is already "hunting" treats on the steps to get her used to going up and down. Very good purchase for our needs.