In direct sunlight it was great, but most of my trip ended up being fairly cloudy so i can't really suggest it unless you know your trip will have great weather. I'll be going back to a dynamo
I've been tempted by the velogical, but haven't had confirmed reports it creates enough power to charge stuff by usb. Plus i'll be building up new proper expedition wheels for this before it's next tour so dynamo is a cheaper option most likely
In direct sunlight it was great, but most of my trip ended up being fairly cloudy so i can't really suggest it unless you know your trip will have great weather. I'll be going back to a dynamo