The topology itself, at a glance, seems to be a cost-effective SRPP circuit that inverts through a transistor and forms a push-pull configuration, and it doesn't appear to have any major issues. I'm not surprised at these measurement values, but it could get a little better if more money were spent, though.
By the way, it seems there are a lot of people on this site who act 'knowledgeable' despite not even being able to read schematics, but is there anyone who can actually point out any problems with this circuit?