Worth the update? - NEW megaAVR-0 Series vs OLD megaAVR MCUs

Microchip released a new line of megaAVR microcontrollers which they call the megaAVR 0-series. How do these new microcontrollers stack up to the old series with legendary microcontrollers such as the ATmega328?

-- Links --
Code: https://github.com/hooperwf1/fading_lights
My Website: https://sinelab.net
--