I was cautiously optimistic since some of the reviewers questioned the durability of this light but I have been happy with it ever since. It seems solid although I haven't dropped it (helmets shouldn't be dropped in the first place). It holds a charge extremely well for such a small unit (lasts 4-5 days for about 2 hours/day before recharge is needed) and I feel like it gives an additional level of visibility and protection. I commute 32 miles a day and spend a lot of time on suburban roads so every bit helps. I use the blinking function every morning and at night in the winter.
I bought this to replace a 10-year-old Giro helmet. Specifically chose for ventilation for warm weather rides. Very comfortable, and the ventilation is really noticeable - I can feel the air crossing my head and coming out the back. Never noticed that before in my other helmets (Giro, Smith Trace).
Only 2 drawbacks. First is that the helmet is kind of loud. As soon as I hit about 18 mph, all of that airflow made it sound like I was going 40 mph. Takes some getting used to. Second is the sunglass garage. There's a little piece of fabric or something to help hold your specs in place, but it doesn't feel real secure. POC should replace that with a silicone patch or something similarly lightweight and grippy.
This is a very light helmet. For me personally, that was not the main motivation for buying it, rather I got it on a great sale and liked the color and overall design. It does lack some adjustability because of the minimal weight, the most noticeable for me being the lack of fore and aft adjustment of the chinstrap and that it runs slightly large. My head measurement falls right in the middle of the fit range (59cm, L says it fits 56-61cm) and it barely gets tight enough for me. With a cycling cap or headband, no problem but if you prefer to ride with nothing under your helmet and are on the smaller end of the size range, you may consider sizing down. All in all a great lid. Holds my glasses well when off my face and interfaces with them well when on (Oakley Sutro/Sutro Light). Vents well and looks good. I haven't crashed (knock on wood) so can't speak to protection, but POC is a reputable brand so I am not concerned there.