Well built. Even up close, it looks EXACTLY like slate/rock, and is quite heavy, contrary to what other reviewers have said. As a matter of fact, I had it set up when my husband got home, and he thought it was made of real slate. 
 I did take one star away from the review because the water flow adjustment doesn't work, so the flow of water is quite loud.  I added some stones to try and quiet it down, which seemed to work a little but it's not the calming slow trickle of water I was looking for.   I will call Wayfair and ask for a replacement pump.  Super easy instructions for install, which took me all of 10 minutes to assemble and fill with water. 
All LED lights work and it arrived in great condition.  All in all I am extremely satisfied with my purchase.