The battery is claimed to be 10 hours, but I didn't test it to that limit. The lenses were really good quality - at least as good as my Tifosi's. Very comfy and

The battery is claimed to be 10 hours, but I didn't test it to that limit. The lenses were really good quality - at least as good as my Tifosi's. Very comfy and stayed in place, which is crucial for AR. They don't actually switch the lenses themselves from clear to dark, it's just the brightness of the text that increases, which is instant. But if you wanted to ride at night, you wouldn't be able to wear them. I agree they're expensive, especially since they aren't self contained like a typical bike head unit is. I keep comparing them to the Form swimming goggles - which are also AR. I feel those are totally worth it. But the Engo's are just a bit too expensive for what you get.