The major disadvantage of the Sanwa JLF is that if a single microswitch fails you will require to purchase a whole replacement board should you lack soldering skills. The Sanwa JLF microswitch PCB also limits you to only using the stock Sanwa microswitches and thus limits your modding options compared to Korean style levers.
The Shuriken JLF PCB fixes all the above issues. With this PCB you now have the option to easily mod your JLF and use any Omron microswitches with a .250'' / 6.35mm terminal without requiring any soldering. As an added bonus the Shuriken JLF PCB is manufactured using 1.6mm thick aluminium for that premium finishing touch and also features a 5 pin connector just like the stock Sanwa PCB.
Please review the manual for installation and switch compatibility.