I wouldn't get a remap without having some validation on a rolling road to be honest.
some of the cars we map, we have to have 2 attempts to get the map perfect.
for instance, in the power test prior to remapping you're basically checking that the engine is healthy, if it isn't, then the problem may have to be sorted prior to remapping for safety, such as a small misfire due to a sticky injector. A problem like this would only be exaggerated by an increase of power.