Haven't seen any mention here of this product. Overview from the site:
This board will connect a standard, modern USB keyboard to a classic Apple //e, via the //e's logic board keyboard connector. The RetroConnector Keyboard Interface replicates all of the functions of the original keyboard, with the added ability to program (using the Arduino IDE) macros, custom key bindings, and special keyboard layouts not available in the original hardware.
https://www.tindie.com/designs/detail/88/
!!!! $65 !!!! that costs more than getting another IIe for the keyboard if yours doesn't work.
If you like retro media (i.e. printed material) it's reviewed in the latest Juiced.GS by yours truly:
https://juiced.gs/index/v18/i2/