I've had this light for several years, long enough that I had to replace the battery pack last year after, probably, 150 recharges.
This light is indestructible and the power meter is accurate and useful. I always know when I come in from a ride whether I need to recharge before the next one.
My schedule forces me to do all my weekday rides in the early morning, so this light gets a lot of use. For weekend rides I put it on blink and don't worry about a car not noticing me coming as it pulls out from a side street.
Years ago I purchased a battery from Niterider with a bad cell and replaced it without question. That was the only time I had to deal with customer service, and it made me a customer for life.
