There isn't anything negative to say about this cat tree.  I am a 66-year-old woman who received this item in less than a week, brought it into the house, opened the box,  and assembled it within an hour.  It slid easily into a corner with windows.  My advice to sliding it is to do so pushing the bottom shelf.  It slides easily that way and doesn't loosen the screws.  I bought the brown and white, didn't think I would like the color, but it looks great!  When assembling, be sure to lay out the pieces, paying close attention to the size of the shelves, how they are placed.  Lay out the posts after measuring them (I used a seamstress tape measure,) for the different sizes.  Leave the screws in the packages because they are labeled. My cats love it and so do I!