I recently demo'd this light (with the helmet mount) during the 25 Hours of Frog Hollow race in Southern Utah. During the race we experienced all kinds of weather conditions -- wind, rain, hail, etc. This was the first time I've used the light, but found it very easy to set up and use. The helmet mount holds the light firmly, but I found it to be easily adjustable while hammering on the bike. The light itself seems attractive and durable in it's CNC machined casing, yet efficiently packaged and lightweight.
Using the light, I knocked out a few one-hour-ish laps on a single charge (used on "low" for the uphills, "high" on the super-fun, ripping downhill), and it still had life. The lower part of the course was pretty technical with plenty of rock slabs and gotchas (exposure, jagged rocks, desert fauna, etc), but I was able to make out the features clearly and maintain lap times consistent with daytime.
At this point, I have not yet tried the TAP technology, but plan to do so in short order given lack of daylight. I plan to post a follow-up once I've had more time with the product.
That said, I'm pretty stoked about my initial impressions.