This flash is really on top. Fully compatible with Canon EOS 450D in E-TTL (the manual mode is also otherwise) and a relatively high power (a par with the Canon 600EX-RT). I did not test the master / slave mode (for later). Rotating flash head (360 °) and adjustable angle is not negligible. For features, I will not repeat the description. For cons, the manual should be revised (or so I understood nothing) because some features are not available for written combinations.
On batteries: Duracell, preloaded and 2400mAh at a low price, this is really great.