In reply to Vaughan:
That is incredibly strange, I was having this exact conversation with a guy from work today, I purchased the Viper in the end because I was unsure as to the practicality of all of the extra functions, including having to scroll through to get to your night vision saving light! Great head torch (the viper one that is), I can vouch for that one at least, it blows my Petzl Tikka Plus 2 out of the water on brighness.
Post edited at 13:04