Poor/awful productivity invites a judgement on low-productivity days, and good/great productivity assigns high productivity as a goal. Substituting very low, low, moderate, high, and very high allows for more universal user input and data assessment. I know for me that very productive days aren’t always “great” because it’s not always my choice to be doing a lot and is sometimes a symptom of mental unhealthy and low productivity days being labeled “poor” makes them seem negative as opposed to necessary for some (read:me, disabled) people.