Garmin makes pretty good products and their UT800 is no different. Its bluetooth compatible and you can hook it up to your existing Garmin Edge device for connectivity. Its baytery life is pretty good lasting around a couple of hours on the solid beam section. I have this parked with the Garmin Varia and they work well with one another. Hopefully their next iteration the light will be better.
Easy to attach to the Garmin computer dual mount without taking up space on the handlebars. Also, very easy to turn on andor adjust mode while riding. It has a reasonable operating time before required recharging. It is also water-resistant as I found out when I was caught in a rainstorm. The headlight continued to function properly while my taillight (another brand) was not able to handle the deluge. However, the Varia is more expensive than other headlights of similar wattage.
The road bike version of Varia 800 comes with dual holder for garmin gps and light. Easy to assemble and has settings for night riding to bright flashing for daytime. My only complaint and its not against the light so much but the blue tooth is interfering with my garmin 810. Its not supposed to work with the 810 but its causing pauseresume issues as its tryng to connect.
Love the style, mount and workmanship. Mounts on the bottom of my Garmin mount. I used a 1030 in top and it connects to the light. I use the light in flasher mode to be seen during the day by motorists.
Only complaint is that battery life seems somewhat less than advertised. I haven't conducted scientific tests, but it seems to need charging more often than I would have thought.