I have one for my KR-808D-1 that came with a starter kit. Frankly I don't use it at all anymore. It took 3 hours to charge it and it charges 2 1/2 batteries. So it's double the normal charging time. I'd rather have an extra charger at home so I can charge 2 batteries at the same time and carry extra batteries with me than the heavy PCC.
It's just one more thing to remember to charge and you can't vape with it as a spare in case of failure.
They seem to be pretty popular though, so maybe it's just me.

