Got mine a couple of days ago and I really like it. It has mode memory but it seems to forget if the battery is removed.
Turbo output is indeed very short-lived, less than a minute I'd say before it kicks down, however the real gem in this light is the next mode below turbo (high) which can sustain 1000 lumens for nearly 3 hours. That's significantly more than the light I upgraded from (Nitecore MH12S) which could only manage about 500 sustained for 3 hours.
I kinda miss the moonlight mode from the light I had before but only for theoretical reasons, I never actually used it.
I'll be using this for cycling with the Fenix bike mount and a Nitecore NFD25 diffuser tip which just about fits on the end despite being 1mm narrower.