I went the 'Deal Extreme' route about 2 years ago and spent about $70 total. It's certainly a good deal for the price, but I don't think it's as good as a Dinotte setup or even better then going with a name brand like Fenix.

The issue I had is that if you bike over really rough roads, occasionally the light will turn off or 'change modes'. It does not happen often, but it has happened to me at bad moments just when a car was approaching. Luckily no incident took place, but it sort of opened my eyes to the fact that the Chinese lights, while a great deal, do have their drawbacks.