I've seen and almost used one – it's huge…bigger than a can of Irn Bru but weighs far less than it looks like it should.
Light output puts everything else in the shade and it is a very wide flood without any distortion/shadow in the beam – seems to also have good distance – at least 60feet without any loss of viewing ability.
Personally I think it is far too bright so would be more inclined to ride it on level 2 (which is still a ridiculous 900+ lumens)…it's well made but it's massive.
If I had the cash and was looking for a light I'd have that about 4th on my list as the size just puts me off…the fact I wouldn't use all the higher outputs either would make it a waste of money as well but if you are looking for something that will create your own sunshine brightness, then this is very good.
I say almost used as it wasn't on my bars but I didn't need my lights on to ride!