Excerpt: I purchased this flash to use on my EOS-M being it doesn't have an onboard flash. I have used it a fair amount and it seems to have a very usable amount of output especially for the size. The only mark against the flash I have is being that the flash cannot be angled it would be nice if it would come with a diffuser.
Excerpt: Since the Canon 6D has no built in flash, it can not remotely fire slave flash units. The Speedlite 90 EX solves this problem. I now can remotely fire both my 580EX and 430 EX speedlites. The 90EX is so small, it can be carried easily in your pocket for those times you need a little fill flash without lugging around the bigger bulkier flashes.
Excerpt: Not only is this little flash great with the EOS M, it works perfectly with any EOS DSLR. It is very tiny, and you can stick it in your pocket or camera bag for fill flash when you need it. At the price, this flash is a no brainer.
Excerpt: I bought this flash as an on board light for my Canon EOS 6D. I used it to with my 430 Speedlite. It worked really well and did not have any misfires. Keep in mind it uses AAA batteries, so you may have to change often on long shoots.
Excerpt: Powerful for its size. Works well, but MUST have absolutely fresh batteries to recycle swiftly. Batteries that have been working in another device will probably appreciably slow down the recycle time.
Pros: Easy to Use, Good in Low Light, Great Picture Quality
Excerpt: Got this to trigger off camera flash with my 6D. Doesn't work reliably, especially in bright (outdoors) conditions. Just not enough output I guess. I ended up getting an STE2, which is much better. As a stand alone flash I also find it too weak for fill flash in brighter conditions. It's really just an emergency flash for quick snapshots in darker conditions. Best to go up the flash line for something with more power for creative lighting potential.
Excerpt: I use this both for my EOS M with 22mm and for fill flash on my 6D, mainly with the 24-105 and 40mm pancake and 50mm. It is great to stick in your pocket with a full frame for fill flash when needed. This thing is quite small, so worth carrying when a larger speedlite would be cumbersome. It certainly won't do much more than your typical built-in flash on any crop sensor EOS, so use it for what it's intended and you'll be happy.
Pros: Easy to Use, Good in Low Light, Great For Fill Flash