I also have one and find it's performance a little frustrating at times. It often "double triggers" when using it off camera with radio triggers, especially when the power is dialed down. Seems ok for me on-camera though, however I always use the Canon 580exII if ever I have a flash on camera.


I haven't had the same power issues as Sean. They're a pretty good price though if you're just wanting a cheap spare, but I probably wouldn't rely on it as my primary.


Ben