I’ve first heard about these DIY kits when they were mentioned in the Joyzz thread . I bought an NES and SNES kit right away and about a week and a half later they have arrived!
PCBs look nice (didn’t bother opening up the controllers again, as you can find pictures of the PCB in 8BitDo’s website) and each package came with its own USB recharging cable and a screwdriver.
Buttons didn’t feel any different than with the regular PCB (why whould they?) and I honestly couldn’t feel much lag with the retro receivers. Overall a nice purchase. I would recommend them!