That's the feature. Cool!

No brainer, then, unless it's horrifically more expensive or something. When I bought mine, the Metz was cheaper than the top of the line Canon EX speedlight. And WAYYYY better.

The model here has old-fashioned "Auto" exposure built-in. Which means it has a puny little photocell for self-metering the amount of light it needs to provide. This is very useful in many many situations where Canon's fsck'd E-TTL algorithms (in the camera body) b0rk things up.

Cheers