I also got mine from the UK chaps last year and they are easily bright enough for fast singletrack. With the 2 sets you get the wide angle set on the bars to give a general flood of light that you can adjust on the fly by tweaking one or both of the lights.
The narrow beam set of the helmet allow you to focus on one part of the trail. It soon becomes clear where you are scanning and you get a very bright section where you look.
I can ride as fast as I can during the day with them, so they either allow you to ride fast or I’m just slow 🙂
There will always be something new, brighter better etc coming. These give you more than enough running time, enough brightness and weigh bugger all.
For me it’s a no brainer – get some.
D