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I had my dynamo wheel built by justridingalong.
Great service and fair cost.
And in maybe 25,000 miles. Not a single issue to re tension needed.
With regards to lights and dynamo. Think about the amount of time your riding in the dark? If it's not long, a battery powered light might do... Also will you be charging from the dynamo or from stops? Or batteries for etrex.
Losing 5W to a dynamo is a fair amount when only doing 140w.
skinny-
It's more than just lighting. It's the ability to charge my Garmin, phone, etc.
I'm also tired of riding around with lights on low power worried it's going to run out, carrying loads of spare lights and batteries for the same reason. If I don't need the power I can switch off the dynamo reducing its load and as for only doing 140W, I don't get out of bed for less than 200.
TransAm record is 17.5 days - you think battery lights are practical for that duration? I don't. Maybe if I was touring and stopping in a hotel every night it would be ok but that's unlikely.
hippy
Are you of the impression it means they only tension half the spokes or something?