Apart from being a thing of great beauty, you'll be struck by the simplicity of the whole battery/lamp mounting combination of this light. If you run a Hope stem then the battery sits neatly below, with the light dead centre above: it's as close as you'll get to perfection.
Other options are available for different stems and you can buy a bar mount/helmet mount combination too. You'll hit the switch first time every time and tweaks of angle take a second - and most importantly, hold firm.
The light quality is outstanding, with more than enough power and a fantastic broad sweep with a superbly even tone. If you can afford it, run - don't walk - to buy this.