It is more complicated, but a better design and build quality with a more powerful processor. Firmware may still be a while before it is fully sorted and there are some alternative gyro tweaks to the IMU board in the pipe, so I believe.
Whereas Alex does a fine job, these guys are a team. It did not take them much time to catch up.
Their FC board is also pretty awesome now that it is more user friendly. When they port this thing to integrate with the FC/GPS then it will be the answer to Zenmuse.