i've had an alpkit gamma for a couple of years now, they're very well made, and cheap, and brighter than most.
it's ok for running on road / pavements where there are no streetlights, but i've got rubbish eyesight, and i do struggle a bit when trying to run along anything technical.
so i bought a Hope adventure - wow.
seriously, wow.
£100 for torch + batteries + charger, but it means i can now run off-road in the dark, without a guaranteed twisted ankle that came with the gamma/anything else i've tried.
obviously i'll keep the gamma for camping, and running on easy stuff.