Car appreciation... the aesthetics, the engineering, etc

The remap looks to be around £250 the box is £400 ish (some sales make it quite a bit less). I guess the question is around doing it in hardware (the box) Vs software (the remap). The box I suppose you can just remove and it goes back to stock. The remap needs to be undone I assume for the same cost again. But this is just from googling.