If you're in a room with nearby white walls, I prefer the Metz 54MZ-4 to any of the Canon flashes (I have 550's and 580's) with StoFens. The Metz is bundled with a dedicated ETTL-II foot but that's moot to me because I only use flashes in manual.
The 54-MZ4 has a small built-in secondary tube that always faces forward. This second small flash has a neutral density cover with a movable hole in it so ND attenuation is optional.
In small white rooms, I tilt and swivel the Metz' main head so it's pointing backwards over my shoulder for bounce. The secondary front tube plus ND provides fill. I often get pleasing results with that setup...diffuse "surround" lighting with gentle fill, from a single on-camera unit without additional accessories. A Canon flash is harder to manage in that situation because of the lack of built-in fill.
An example of this use of the Metz 54MZ is on pbase.com is in the directory kmsarno/image/56518501. It's my 3-year-old grand-niece, shot with an EOS 5D at ASA 200 in RAW mode with the EF 24-105L at 105. f/6.3 at 1/125, processed quite minimally with RSP 2006 and PS CS2. (Note: Back-focus is a separate issue :-)).
--Ken S.
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