I am currently picking out a flash (speedlite) for Canon XSI. There is a number of third party flashes available from manufacturers other than Canon. They all claim to be Canon compatible but I have my doubts. I don't think any of those flash units work as great as ones made by Canon. I would like to know your opinion on the subject based on your expertise; what brands, models of third party speedlites work the best with Canon?
The most important features for me, that the flash must support are auto mode, zooming and e-ttl. For comparison it should be close in features to Speedlite 430EX II