Lots of positives!  It's real wood, handles 400+ lbs, has a dozen little details like tape to keep the mattress from shifting, and made my years old mattress feel much firmer.
Would give it 5 stars except for one very small quibble - one of the metal connection plates was connected at a slight angle which made it not fit into the other connector.  Removed the top 3 screws, pushed it to straight and screwed it back in.