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I have used both the XXL LCD for my printer (Robo3D) and the Full Graphics LCD for the MP CNC. They both came from ebay sellers but I don’t remember which right now. The smart LCD that you list has the same functionality and firmware requirements to the XXL LCD, the only difference is in the display module size. These LCDs are so simple that you probably can’t go wrong with cheap one from ebay. The only problem I noticed is that the quality of the rotary encoder my Full Graphics one is not as good as the XXL. It sometimes oversteps a menu item as I scroll down.
For $10 plus shipping I would go for the regular Smart Display Controller. Yes, that #define looks like the only one you need to uncomment.