I don't think I've heard very many, if ANY complaints about Dynamo hubs, regardless of manufacturer.

For a "practical" bicycle, one that is used as a commuter, tourer or utility bike, it's a no brainier. Dynamo powered lights augmented with battery powered backups or flashers. Add to the package the ability to charge stuff on tour, and it's a pretty useful item. There is an upfront cost, but in the long run you'll be happy you did it.