A quick intro to Canon’s Flash Series Numbers, is that the numbers refer to the guide numbers. For those of you unfamiliar with this, suffice it to say, the higher the number, the greater the power.
While I do not consider the 320 a pro-level flash, it is not a bad little back up for the casual shooter. What makes it unique is the built in LED video light as well as the built in remote shutter release.
While the video light is not that strong, if you know what you are doing with your ISO, it enough to make a difference. There have been a few times in the last year it saved the day.