The king bedframe is very sturdy and easy to assemble, however the screws that our new headboard came with (also bought on wayfair) did not fit the predrilled metal slats of the frame. We decided to file down the metal slats in order to get the screws to go in, instead of dealing with removing our heavy bed, sending back the frame,  and then having to deal with ordering something new again. 
Otherwise it's a solid frame and I love that it doesn't have wheels - something I always disliked in previous frames we owned.  The metal feet are very solid and better for carpet.