I've been tempted by this as an alternative to getting a hub dynamo wheel built up. What has prevented me from ordering one is a) the noise - which seems to vary between 'can't hear it over the wind' to 'banshee wail' according to reports, I think a lot depends on how parallel to the rim you get it b) potential difficulty on installing it on the front wheel of a Moulton (back wheel would be fine, but I don't like trailing wires along the length of a bike, especially when it would only be powering a front light c) for €150 I could get a SP hub front wheel built and I don't swap wheels/bikes etc. In the plus column this leaves it's lighter (the Moulton's a boat anchor so not really an advantage) less drag when it isn't being used (but I don't think dyno hub drag is that much of a problem). I'm still tempted just because it's a a cool bit of engineering and it would fit with the Moulton's over-engineered solution that gives marginal gains ethos.