It worked really well for mobile but didn't have so much luck charging my external battery pack or my USB charged bike light - but figure these are likely to be due to limits of current output from dynamo. Not the prettiest but would recommend. Kept on top tube with mobile charging in frame bag.
Can see myself getting Quad lock mobile phone mount combined with waterproof mobile phone and you're away laughing
I piciked up Velocharger Hub recently to keep my mobile juiced whilst on tour.
http://www.adeptelectronics.co.uk/velohub.html
It worked really well for mobile but didn't have so much luck charging my external battery pack or my USB charged bike light - but figure these are likely to be due to limits of current output from dynamo. Not the prettiest but would recommend. Kept on top tube with mobile charging in frame bag.
Can see myself getting Quad lock mobile phone mount combined with waterproof mobile phone and you're away laughing