The datalogit allows you (or your tuner) to copy your map, up load new maps, do live tuning, modify airflow curves etc.
You can have as many maps as you like saved on a net book or laptop and swap them into the PFC at will.
I have a BP98 map and a United P100 map..... I only run P100 now but if I go down south I can throw the 98 map back in if I need to fill up with 98 (or I can just drop the boost to 1.4bar & run 98 ping free).
They are only available from
FC Datalogit - Tuning Software for your APEXi Power FC
If you own a Powerfc they are money well spent if you understand the Powerfc tuning methodology.