The Pros: This flash is small and easy to pack and take everywhere. It's far more powerful than the camera built-in flash and it recycles fast. I was able to use burst mode with it; something that is impossible with the built-in. It also uses AA batteries and they seem to last for a few hundred pictures. It can be used to bounce the flash off the ceiling, but not the side walls.
The Cons: If you use the Auto White-Balance on your camera, this flash will produce a yellowish tint when used directly, as compared to the camera built-in flash which will usually produce a neutral while light. This flash will also produce a reddish tint when bounced off a perfectly bright white ceiling. So, make sure to change the white-balance on your camera to the flash setting to get good results with this flash.