When I started taking my 7 year old grandson out in his neighborhood I noticed how many people might back out of their driveway and see him at the last second. There are no sidewalks in the neighborhood so we don't have that option. These lights dramatically improve his visibility to motorists and walkers. They are easy to charge and would also be fine on your road bike for casual commuting. I want something a lot brighter for early morning , winter gloom or twilight rides All of the Lezyne products I have bought have met or exceeded expections.
Another on-line review said there are two kinds of people: those who don't have a Varia and don't see the need for one and those who have one and wouldn't ride without it. I moved from the first group to the second.
Easy interface with Wahoo computer. I turned off the audible alerts: TMI and annoying. But glancing down from time to time I see what's coming well before I hear it. I've tried to catch it making errors but so far have not been able to. Even tells you how many cars are coming. The LED alerts are usually washed out in daylight so are not that helpful.
I have my Varia RTL515 mounted on the back of my seat bag so the radar unit is positioned high for maximum distance and no interference from the rear tire. Although I like using it on small group rides it seems to be most beneficial on solo rides, keeping me aware of all rear approaching vehicles in plenty of time. The unit works as advertised and is living up to my expectations although I would have liked longer battery life. Isn't that always the case.
This is a really good, simple solution for anyone with a Giro helmet using Roc Loc 5 retention. I use this on my Vanquish and it works perfectly. Button is easy to find, it doesn't inhibit access to the retention adjustment and it doesn't add a lot of weight or jostle around like a velcro'ed on clip light would. I honestly don't even realize it's there after I turn it on. It's bright, it mounts securely, and the USB port is easily accessible without removing it from the helmet.
If I had to come up with a negative... and I'd be really grasping to do so... be nice if it had a 3rd light mode with maybe a little more irregular pattern. But again, that's really a stretch to come up with something negative.