I feel is another flash...a stronger flash! I currently have only the 430 EX II. I've been looking at the refurbished Canon 600 EX-RT offered by the Canon store for $440, but it's out of stock. I'm also looking at the YN 568 EX II. Any of you have any positive experiences with 3rd party flashes?
I just read a lot of reviews about the Yongnuos, and then bought a 2nd 600ex-rt, for a hilarious amount of money I might add. If you come from a 430ex2 (I've got one, too) the yn568ex2 should be more than fine, esp. considering the price, but it has some drawbacks:
* No built-in radio control, you need a dedicated trigger which adds bulk you might not want. So if you want 3rd party, you should think about waiting for the next Yongnuo speetlite w/ built-in radio, their manual flash already has it. Optical control is a big hassle, indoors it might work, outdoors it's a nightmare.
* The 600ex-rt has a 200mm reflector which is extremely helpful for outdoor tele flashing, and of course the Canon has tons of other nice features like linked shot & group mode (read the respective reviews on that) while the 3rd party copies more or less imitate the 580ex2.
* The display & usability of the 600rt is absolutely terrific esp. when changing settings in a hurry, so the question is: What do you intend to shoot with the flashes?
Btw: pro Yongnuos radio trigger: They have remote 2nd curtain sync, take that, Canon...
Last not least: great site on flashes, no ad intended: http://flashhavoc.com/yongnuo-yn-568ex-ii-canon/