Just had it 2 days! So not tried it in anger yet.
I have been off-roading at night since 2003 though, and I can tell you already it’s far brighter than anything I’ve used previously (and that includes for 24hr races etc). I can’t see me being unhappy with it.
I’ll probably go with helmet mount at first, though with a light on the bars too, as I find just a lid-light “flattens” the trail as it doesn’t cast shadows you can see on bumps etc. So as it’s brighter than anything else I have, for this reason it may end up on the bars.
Though where you put most of your light depends where you ride. I mostly night ride in open hills (pentlands) at the moment, where a bar light is no issue. But when it was twisty-woody singletrack (Ashton Court) then a head light makes a lot more sense.