The Eink Feather Friend is much friendlier - it comes with  256 Kilobit (32 Kilobyte) SRAM chip. That means you can control up to a 4.2" 300x400 tri-color display (300*400 * 2 colors / 8 bits-per-byte = 30KB).  This chip shares the SPI port the eInk display uses, so you only need one extra pin. And, no more frame-buffering! You can use the SRAM to set up whatever you want to display, then shuffle data from SRAM to eInk when you're ready. The library we wrote does all the work for you, you can just interface with it as if it were an Adafruit_GFX compatible display. If you prefer not to use the chip, our libraries will automatically use the microcontroller/microcomputer internal RAM.

We even tossed on a MicroSD socket so you can store images, text files, whatever you like to display. Comes assembled and tested, with some header. You'll need a soldering iron to attach the header for installing onto your Feather. Stacking headers will let you put another FeatherWing on top.