The Pl6 will handle anything the rc car enthusiast would ever need to do. You don't really need the Pl8 unless you are into high power helicopter or airplanes where you will need to charge 8s packs. With the proper power supply the Pl6 can charge 6 6s packs in parallel quickly and safely.

Get the computer USB interface cord and use CCS software for IR values and pack graphing and comparing.

Great charger!