Are the Data-Driven Global Aeronautical Maps a legal replacement for charts?

The Data-Driven Global Aeronautical Maps are a great tool for improving situational awareness and can be overlaid over VFR and IFR charts, but they are not currently intended to completely replace charts. You should continue to download the appropriate charts for your needs and use the Pack feature before your flight to ensure all the items you will need are available and up to date.