Something I have noticed with this flashlight is that it seems to have memory.
It returns to the last mode you had it on, which is something they don't mention in the instructions.
It was implemented about as well as a memory function can be I suppose, but the memory function means that if I use a different mode than I normally do I would have to make sure it's on my preferred mode before turning it off so it turns on in that mode next time.
If it had a default of high or medium I would probably just stick to whichever mode that happens to be most of the time.