If I needed the AF assist and it was a critical work environment, wedding receptions etc, I'd suck it up and get a 600 for on camera, besides, it is rare that an on camera fill or bounce is useless in those situations.
Jee-jay! After only two months of waiting for this thing from China, I finally have the item of my dreams in my hand. Lesson learnt #1: Don't buy from shady e-Bay sellers to save €5. Speaking of cheap, here's my impression.
Let's start with the positive facts:
+ Yn is cheap
+ Yn rembers the HSS setting even after switching through modes, Canon forgets it once you cycle though ext-a and you have to set it again.
+ Yn works with my pre-2012 60d and supports linked shot, though it needs a shutter release cable.
This leaves a mixed feeling:
+- Yn supports 2nd curtain remote. But, alas, not only does it work in M mode as written in the specs but it doesn't work in M group mode
but only in the good ol' a:b:c ratio system.
+- Yn doesn't support 1/2 ev stops and interprets -1/2 ev fec as 1/1 (not -1/3 as it would make sense). For the 6d, this happens to be a blessing in disguise as you can use max. x-sync of 1/180s and still set 1/3 stops on flash.
Next up are the downers:
- Yn's wheel is really way too easy to move, when in a hurry you're not able to set it precisely.
- Yn has no personal functions if that matters to you.
- Yn's power saving setting is only off or the very short 5min, not 10/60 min like Canon
Last not least, here's the complete bummer:
- Yn has af assist
, the very reason I bought it. Unfortunately this is completely useless
as it uses a fixed pattern that projects the red stripes in almost all cases next to the center af point
EDIT: This is not just my unit, it's a systematic failure on the Yn! The pattern is too wide so you need to move either the trigger in the hotshoe or walk back and forth which makes it "nice to have" for pitch black indoor shooting of static scenes, but utterly useless for anything that moves. Doh, it I wouldn't need this to make my 60D work with the rt flashes I'd return it http://flashhavoc.com/yongnuo-yn12af-af-assistant/comment-page-1/#comment-16032