I originally bought this because a few people on a similar forum recommended it because it had similar specs as the Canon 550EX, but at half the price.
I guess it does have similar specs. But it's built so cheaply, I found it unusable. I'm not lying when I say that I felt it was built like a toy.
When I started testing it, I immediately noticed that the controls (sliders) are so small that I had to use my thumbnail to move them. That irritated me, but I tried to learn to like it. I kept testing it for a bit longer. Within two hours the automatic zoom head stopped working. Checked the batteries, reset the flash and the camera, and even gave it a little elbow juice. Never worked again.
I returned it, and bought the Canon 430EX instead (and I love it). There's no comparison. I strongly urge anyone who's interested in this flash, to buy the Canon 430EX as well (or the 550EX, although I returned that beast, too, because it was too big) and compare them .