I've got nothing to compare it with but it charges stuff so it does what it's supposed to. I thought it was rated pretty highly against other devices in terms of power output.
I guess that’s the thing. If you’re trying to run lights and power your phone and gps all at the same time I imagine your use is different. All i want is something to charge a power bank during the day on flats or downhill.
How is it? Heard some opinions that the power throughput is pretty poor.