Rating: 2 / 5
I don't have a Brunton Helios lighter, but unfortunately there isn't a way to comment without giving a rating. I do, however, have six butane 'windproof' lighters/torches: a Brunton Firelight, a Solo Storm, a Colibri CX Gear, a Mega Pocket Torch, and two cheapo no-names. None of them work reliably at altitude (10,000ft +) and below freezing, and only one of them works at a level I would describe as reliable (a $5 blue no-name purchased at The Powder Horn in Bozeman, MT). The piezo sparkers work fine, but the gas doesn't seem to want to light right away. Usually after a half-dozen clicks the lighter will go, and will then start more often than not. After running for over 30 seconds, however, they generally won't light until they warm up again.
The non-torch Bic butane, of course, lights reliably every time.
Fuel can be a factor. Cheap butane won't do for a torch--triple refined premium butane from Korea seems to be best (such as Lucienne brand). I found Colibri Premium butane to not work well with my lighters, including the Colibri lighter.
I like the butane torches because they are _hot_(much better than a generic butane lighter for melting nylon rope ends, and they can heat up a cold alcohol stove quickly), but I won't rely on one as my only ignition source. Based on my experience with these, I'm resisting spending $$$ on a Colibri torch that has an altitude fuel adjustment; I'm not sure it would be any more reliable than what I have now.
I'd like to see a review of any windproof butane torch that somebody finds truly reliable under all conditions.