The "slate" is "slate."  It is not black, it is gray and, depending upon the light, has bluish tints.  Delivery took a long time due to our geography but local freight company was responsive and installation was quick, professional and efficient.  Given the weight of this product, it is well worth purchasing the "white glove" delivery option.  Structure is very good and our "organic" mattress fit the frame perfectly.  With one night's sleep under my back, I rate this as delivering everything promised, and more....   

Pros: Price, Quality of materials, appearance, white glove service
Cons: None at this point