Do also be aware that on 19 November, Metz filed for insolvency having previously gone down the Protection from Creditors route.
While the reputation of their speedlight / flash units is unparalleled - and yes, I DO mean UNPARALLELED - if something should happen to go wrong then there's the possibility that you wouldn't be able to get it fixed easily. The Insolvency Practitioners said that production and customer services would continue "For The Time Being" (aka we're going to struggle along to see if we can sell the company as a going concern rather than just kill it dead) and there are measures in place to ensure continuity until the end of January 2015. After that time ........ who knows.
Like Wilt, I have used (aka thrashed the living daylights out of them) Metz professionally since the 1960s with just one failure - a new tube a couple of years ago. OTH, the units in question are their first real venture into the field of strobe / studio flash. Much though I like Metz products and came to rely on them totally, I'd tend to look elsewhere for studio flash now simply to avoid any potential future supply problems.