The ST Cycler is a slight refresh of an older design, which I believe was originally called the Jet-III ST. That version had Jetbeam's Infinite Brightness System to allow the user to custom-program each of three brightness settings. I don't know if this version has the same flexibility, but honestly, as a bike light, multiple modes is not terribly useful. If you're riding at night, you need full brightness so you can see obstacles far away; if you're riding near sunset, you may not need a lot of light to see, but you still need full brightness
so cars will see you, and pedestrians won't be blinded because their eyes are still daytime-adjusted. I haven't found a situation yet where anything less than full brightness was actually useful while riding my bike, so I opted for a different solution:
For roughly the same price as the ST Cycler, I put together a Solarforce housing (which can be easily replaced if damaged in a crash), a Malkoff M60F drop-in (which is fully-potted for ultimate ruggedness), and a pair of brake-reflector brackets rigged together to make an angle-adjustable mounting bracket. The under-handlebar positioning effectively shields the light from damaged in the most likely crash scenarios, something which (as far as I know) no commercial bike-light mount can claim. I even replaced the switch with a McClicky for a few extra bucks. It's drop-dead reliable, it doesn't wobble around no matter how hard I hit stuff, and I spent money on durability instead of features I'll probably never use.