For the price (6 anything including shipping), it is a good deal. The quality is not original, but pretty close to it. Everything fits quite well, screws and rubber buffers are included, also pretty close to the original that costs many times over. Thoroughly recommended.
And to answer definitively at this question (before buying I had all kinds of contradictory answers to my question received): Yes, this Caddy corresponds to its masses exactly the original Lenovo Caddy, and is thus something suitable for Ultrabay Slim of the height.