Excerpt: Just purcased this flash for indoor event use.Works great, and recycles fast (I'm using Eneloop Pro 2550mAh batteries).Remote slave function also works great, I tested it, and it looks like it does what it's meant to.It's a compact unit, and won't add too much weight to a medium sized Canon DSLR (eg, 70D).It doesn't have an option to use an external battery pack with it, but you don't need it.
Pros: Consistent Output, Durable, Easy To Use, Fast Recycling, Lightweight, Powerful Output, Versatile
Excerpt: After reading the reviews I picked this unit as the best combo of features and price for my use. I've only used it on the automatic setting and have shot about 300 images. Interior pictures in a home using bounce flash off the celing worked great. Outside pictures needed the direct flash with either the built in diffuser or an external one for shots under about 10 feet. The flash has a lot more capacity than I've used and look forward to becoming a more experienced user.