I just came back from night ride and this wide angle lens is awesome. The whole trail is nicely bright from side to side, with no "hot spot" as with original lens. The only drawback is that light output is not as strong as through the original (plain) lens... Hard to decide which one is best. It depends on the trail or personal preferences I guess.
That's what I think:
- Original / plain lens for straight trails with not many sharp turns, where seeing from far away is important (night rides alone - dogs, freaks etc ), great for "cutting through" cars lights when riding in the city... This one is more like a very powerful flashlight with some good flood light and one round hot spot.
- Wide angle lens great for mountain biking, trails with turns and uneven surface, light distribution is very wide and even with good throw. You can easily see double lane road with this one, but with much shorter throw.

Both lenses will be a good choice for riding fast, even 20+ mph

Photos of wide angle lens ( the one pointing at the building is about 30 ft away, and the one pointing at the mail box is about 50-60 ft away. Photos taken with cell camera, ... It's much brighter and with better throw than you see on the pic... )