Pro: Large size 14"x24", washable and easily removable slip cover, easy to install, sturdy
Cons: plastic legs and base, Velcro (or screws) used as attachment to sill.

What do you expect for the low price?

Does it work? YES!!!
Do the cats like it? YES!!!
Is it easy to assemble and installed in seconds? YES!!!
Can it handle heavy cats or more than one cat? YES!!!
Buy it! You will see that it works, your cats like it, and everyone is happy!