I've had the Yongnuo YN622 flash triggers for a while now and I think it's time to share my experiences with you guys. The reason why it took me some long to make this review is because I don't use off-camera flash as much as I used to. But during that time that I do need some extra light, I pull out the YN622.
Yongnuo YN622 have two functions that separate them from the standard manual flash trigger.
E-TTL: This means that you can basically make the flash act automatically. It'll choose the correct power output depending on the available light and the distance from the subject. Having E-TTL also means that you'll be able to control the flash from the cameras flash menu rather than having to walk to the flash all the time. A HUGE plus.
High-Speed Sync: HSS give you the ability to shoot over your usual flash sync speed limit of anywhere between 1/160 - 1/320 of a second. This give you the ability to open up you aperture during the dat. It also allows you to easily over power the sun without using ND filters.
To be able to use E-TTL and HSS with the Youngnuo YN622, you'll need a flash that supports those two things. The options right now are Canon's and Nikon's flagship flashes, or the Yonguo YN-586ex, which I own and use.
The build quality of the Yongnuo YN622 is very good. Are they pocket wizard good? I doubt it. But I've dropped them a few times and they work perfectly fine.
Ease of Use
The Yongnuo YN622 are very simple to use. Once you set up the triggers on your flash and camera, all of the setting can be changed within the cameras flash menu. This is one of the reasons you might want to pick up the YN622 even if you don't plan to use high-speed sync!
Like I said earlier, I haven't done too much off camera flash in the past few years, but here are some shots that I've taken with the Yongnuo YN622 flash triggers.