Just to strike a contrary note: i'd get rid of a Metz 60 unit in a flash.
Having to carry not just a flash, with a cable running from it to the camera/lens, but also a heavy battery pack with a thick cable running from it to the flash is a pain in the posterior of considerable size.
For the life of me, i can't understand why people put up with it.
It's not a power thing, since the Metz 45 series are not even one stop less powerful.
It can't be battery capacity either, since it is so much easier to carry spare batteries for an AA-consuming unit than having to haul that archaic battery pack around.
And putting a set of fresh batteries in a 45 unit takes 3 seconds. If that long at all.
Nor can it be cycle time, since the 60 units aren't faster than other units.
Besides: doesn't it say "i have owned", perhaps as in "no longer do"?