I ordered the Metz back in 12/14 with a B&H rebate offer and a February predicted delivery. It kept getting deferred to new dates but I wasn't desparate for it as I thought of it as simply a good, little TTL fill flash. Last week, after the latest deferral, I used the credit toward the i40 Nissin and have to say, after reading mixed reviews of the Metz from other camera brands that it made it market for, I'm glad I ended up with Nissin. Reasonable quality (might have expected more for the price, though) and I actually like the accuracy, coverage and predictable results.
My biggest interest in the Metz involvement with Fuji was the hope that they would then produce modules and versions of their serious flash units for the X series. If they do, it's likely a ways off.