My only direct experience with such dynamos has been limited to an AUFA model that I finally replaced with a more reliable hub type dynamo.
All spoke dynamos suffer IMO to have one or more internal plastic gears that are pretty noisy, reduce overall efficiency and are subject to a fast tearing-out of the entire mechanism. On top of that, except for the AUFA, all the other ones are permanently engaged with the spokes and so far, either you need them or not, they’ll be rotating the whole time.
I personally don’t like them.