I have two of these below, one of which I've had for probably close to 3 years. I have had to buy an additional battery pack because the original crapped out and a charger broke. I can't speak for consistent long time use because they're used for winter commuting and night mountain biking. They are really bright though.

It's hard to go wrong for the price. Between the two lights, new battery pack and charger I probably have only $75-$80 invested.

http://www.amazon.com/SUPERNIGHT-TM-...led+bike+light