More than anything else, this light wins our Editors' Choice award because of the awesome beam quality. The competition was tough, but the other lights generally had a more narrow beam. The 800's wide and even pattern pumps light to the edges of your peripheral vision. The beam distance was also among the best tested and shines an impressive 160 meters. All of this comes at a good price. Its closest competitor is the NiteRider Lumina 550. The 550 did not score as high for beam quality, but it is about $50 less expensive and much easier to get on and off the handlebars. If you don't mind a slightly narrower beam, it is a great option.
For the ultimate mountain biking light, we recommend the NiteRider Pro 1800. Check out the Cygolite Metro 360 if you're on a tighter budget.
The Cygolite Expilion 800 has been replaced by the Cygolite Expilion 850.