I have two of these flashes and I love them for many reasons:Using them is simple as can be because they have no power controls on them, that I know of. There is just a on/off switch and a switch on the front that I haven't found to do anything at all..They are bright enough for even the darkest of scenes and work great bounced off of ceilings, walls, etc.I've used these off camera at a concert and they performed perfectly, I shot for hours without them overheating or the batteries dying.They're built like tanks, I dropped them more times than I should have and they weren't effected in the slightest bit.I recommend these to anyone who want to start using flash, especially off camera. Pair these up with some Cowboy Studio triggers/receivers and you'll be set.CowboyStudio NPT-04 4 Channel Wireless Trigger for External Speelights with 1 Trigger and 2 Receivers (NPT-04+extra receiver)