Excerpt: Like some others here, I bought this to replace a cheap knockoff. In my case a Yongnuo SF-18, which failed after a couple years and a half dozen events. I hope this does better, but I am not encouraged by the cheezy non-user-replaceable cable or the flimsy plastic clips on the battery tray. The clips are especially stressed by Low Self Discharge batteries like Eneloop and Imedion, which tend to be larger diameter than Alkalines.
Excerpt: I was unhappy with the recycle time for my Canon 580 EX II flash used as daylight fill flash for bird photography. I decided to go with the Canon battery pack over the knockoffs because of quality issues and the much more expensive and powerful accessory batteries because I read reviews on how they burned up Canon flashes.
Pros: Easy To Pack, Easy to Use, Lightweight, Reliable, Strong Construction
Excerpt: I am birds photography ,some times I should shot after dark ( mostly owls) so i need fast flash for that, i have canon EX600 which great one but 4 AA battary not enough, when i shot by my 1DX or 7D some of pictures come without light! but after i get this i can shot many fast frames without any lost light ! I am happy with it ended.
Excerpt: Have you ever had to stop and swap out your flash batteries? Yea, me too. I know I've lost a Kodak moment or two while trying to put fresh batteries in. With a little practice you can get pretty fast at it but in the time it takes to open the battery compartment door, remove the old, find the new and insert them in the right order, shut the door and power the flash back on you could still be shooting and not missing the shot of a life time.
Pros: Convenient, Easy To Pack, Easy to Use, Lightweight, Reliable, Strong Construction