We liked the powerful beam from this light - the clean tone gave great clarity but it didn't provide enough in the way of peripheral vision for us when we took it for a spin on our favourite gnarly night-time trails.
Having said that, if you're mainly riding fire roads, tracks or on the road (that is, in a straight line) the Nitefux provides enough reach for your fastest rides. The mount takes some sorting but feels secure once it's in place.
Our main beef with ease of use, however, is fixing the battery. The cylindrical shape is best suited to going in a bottle cage, but it's too small to sit firmly in place and needs liberal use of the Velcro - and we weren't completely confident of keeping it in one place by lashing it round any available bit of tube.
This light does come with a helmet mount but it's a little on the heavy side, plus there's that battery again - it doesn't sit well in a back pocket.