Noteworthy limitation [1]:
> The only gotcha is that the FPGA onchip memory is OTP, so it should either be loaded by external CPU over SPI, or from external SPI Flash, in both cases the SPI pins are user defined IO after bootstrap. Or then fixed configuration is burned into OTP.
Basically, while it -may- retail for $5 you will need an external CPU or flash for it to work. This sounds like a heavily restrictive limitation. I'd rather pay for a $8 FPGA module with actual persistent memory.