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I'll be starting my second winter with one on Monday. Instructions are a bit confusing at first, but got it going soon enough and can't fault it. Had to use the thicker ring of the two for downpours until I happened to put wider rims on.
I think I read that it's powerful enough to keep a USB device topped up, but not charge. I haven't tried as it doesn't really bother me at the mo.
Did anyone try one of those Velogical rim dynamos? If anyone has any hands on experience I might be tempted rather than building up a new wheel...