At the mountain I can not recommend it. For this, the Philips LED bike light Safe Ride 80 is my absolute favorite. It is once again significantly lighter and provides an almost 2x as big cone of light. However, it costs about 20 more.
Busch & Müller Ixon IQ:
Pro:
-very bright
-Good battery life (with Enelope batteries)
-stable (both the holder as well as the light itself)
Contraindications:
-schmaler beam