I'm enjoying playing with this display wired to a FLIP; have displayed large fonts, different orientations, random numbers, programs running from EEPROM.
However, I may have already partly damaged it. When the display toggles from "white paper" to black, there are multiple vertical white lines in the black.
The Product ID 28084 Details Key Specifications page says "Operating voltage: 3.3V/5V".
I took this to mean the display would operate on either 3.3 volts or 5 volts. But when connected to the FLIP USB5V pin, nothing on the display at all. Does not do the black / white / black / white routine when powered up to get rid of ghosting. My multimeter shows this pin to have 5 volts. Then when hooked back to the FLIP 3.3 volt pin, it works.
The Waveshare Specifications page 17 Maximum Ratings says: "Logic supply voltage -0.5 to +4.0 volts." This makes me think the device should be connected only to 3.3 volts.