For the money, I am impressed.
This flash is easy to install and operate. I have not used it enough to get an idea of battery life yet. The Battery door is kind of hard to get closed and if you are not a patient person I could see some people breaking it. Some reviews mention the flash spinning around on their lens, I can see that happening. See mine mounted, it is up side down and stays put just fine. I was considering the Canon for around $550. I am very glad I bought this one instead.