Can't say why they're not popular in the German forum. What are they complaining about and which models? I'd say the phantoms or the blackhawks would be the best Raiden binding for what you're looking to do. The 390 Boss are great bindings, but are probably a little soft and more park oriented for your board and what you want to ride.
FWIW I'm buying into the hype behind Raiden and picking up a pair of Machines