I know it seems like an awful lot of money for a headtorch, but this really is in a league of its own. I already had a couple of Petzl torches and, as I noted in another online review, after using this you will be utterly disappointed when you return to your original torch.
I use it primarily for serious night-time walking with our German pointer, who has the ability to disappear into the darkness with ruthless efficiency. The 'reactive' setting is amazing in bring able to go from quite stunning wide-angle lighting to long-distance spotlight in milliseconds by just inclining the head upwards! Which, of course, enables me to check on the hound's progress on the other side of a field..
It's bright enough to stun oncoming drivers to slow down and take care passing on narrow roads too, although the reactive setting isn't suitable for cycling as oncoming headlights will cause the torch to lessen its output immediately.
The light output is quite stunning, even in low-level mode and provides immediate coverage of wherever you might be walking, giving much more confidence than I had with my other Petzls. The battery seems to be lasting well, having already been out for a few hours on the initial charge.
If you are dithering because of the price, don't; you won't regret it.