There are a couple of threads on the GolfWRX forum about these irons - Mainly comparing them to the Ping Eye 2's which they resemble - Consensus is that they are much softer then the Eye 2's but that wouldn't be difficult as the Eye 2's were totally lacking in the feel dept! - The Gold's do not feature on the Mizuno Timeline for clubs, so were most likely only produced in Japan & not Europe or the US - Hope that helps?
Paul