i have no experience of these Nitro x other than to say you dont get owt for nowt! Anything that claims to have multiple maps for a non fly by wire bike like the SP is bullshit though. On the SP's or any other bike that has a direct link between throttle and butterflies there is only ever one correct fuel map at any one state of tune and dependant on exhaust, airbox, filters , fuel etc. There is only one correct ratio of fuel to air otherwise you waste fuel if rich or run too hot if lean and niether give you any more power. Bikes with multiple "maps" really have multiple throttle responses and or retard the timing to lower the power output, could be wrong though, it has been known
Stick with the power commander
or go Megasquirt if you feel fancy