I just used the Eneloops at 14mm and 42mm that have taken over 200 shots.
Recycle time instant for the first 2, then 2 seconds for the third.
Wait four seconds, and it's back to instant for the next 2.
Recharged Eneloops from 2 days ago, instant.
All this in a room with incandescent lighting, so not totally dark!
Not scientific, but I never had a problem except when I had crazy people wanting me to take action shots.
As you do...
True burst flash would have made timing easier!
So, for my uses, it's perfectly adequate. YMMV. I almost went for the Mwtz 48, but was reassured by others that for normal everyday use it's perfectly adequate. I agree.
I don't anticipate needing a faster flash. If you do, then a 4-battery unit should by all accounts be faster. I think the Metz 48 represents better value than the 58, as I seem to recall from a different thread that the power difference isn't that great compared to the FL50 when connected to 4/3rds.
DavidJ.
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If you think education is expensive, try ignorance.