This bed is pretty good value for the price. May not be best for really thick mattresses.
I purchased full size model FFLW010FU. The assembly requires over 80 screws. I did it alone, through instructions say don't do that. It comes with a wrench that fits all the screws (though ratchet might be better). Parts are labeled with a number or letter and there was one extra of each of the 8 screw types. All parts fit together, there was no warping or bad screws/bolts (bolts are built into the wood/metal). The packaging was efficient (and heavy) and the contents were undamaged.
Support is through email and they want an order number, name, phone and email to help. I don't like sharing information. They responded in a few hours...certainly less than 24. Based on 5a response, I assume they are off-shore. There is no phone support. Chat wasn't responsive. The instructions were readable. The QR code to look up a digital copy of the instructions was on the shipping box. The digital instructions for the full bed are under the queen model number FFLW010QU. That's not documented anywhere.
https://www.dropbox.com/scl/fi/c7137g47q3govtnsetzs6/FFLWL010QU-manual.pdf?rlkey=vhr8k6ggdi9k6gndo948j1tpb%26st=c3qrnhw6%26dl=0
There are a few points where the orientation of a part is really important, and the instructions are subtle about showing that. So I did step 1 incorrectly and had to redo it at the end. Step 13 bothered me, there is this big square indentation in the metal that looks like it is made for the legs that are being attached, but noooo, that is the side for the screw. I tried both orientations twice, before deciding.
As far as quality, the headboard that faces the wall is not meant to be seen. That's ok for me. The rails that run lengthwise are two pieces that are joined together with screws (step 6). The joined pieces don't look like a solid piece from the side, but that's usually covered by a blanket, anyway. Frame is part wood/part metal. The headboard and footboard are mounted to a metal frame, but the two joined pieces of wood veneer lengthwise are not metal reinforced except at the joint. There is metal across the middle of the bed both lengthwise and across, as well as a few extra metal legs (so 9 legs touching the floor). With a mattress on the bed it feels solid. The wood veneer finishes on the headboard and footboard are kind of an ugly color...the picture shows it, but not prominently. The wood slats are not the best, but not the worst, either. I think it is rated for 500 LB, I assume that includes people and mattress...but I don't know.
I'll probably move the bed soon, loosening eight screws will let me break down the bed into 5 parts (head, foot, 2 side rails, and slats).
My mattress is not super thick...I'm thinking maybe 10" but I didn't measure. It comes to the very top of the footboard. I think a 14" mattress would look odd.