Good Quality.  Thin pad - we may get replacements. Good for the price. 
Lousy instructions for assembly. 
Tips: Have a set of pliers (instead of included wrench) for the bolts. Needle nose better so they can lock on the bolt.  Standing it on end makes step 1 easier. also having a second pair of hands. 
Step 1: Avoid my mistake  - one piece curves up and the other down.
Step 2: Spacers only go on the top hole when there are 2 holes together - picture wasn't clear. 
Step 3: easiest step.