So along with my newly purchased GH4, I also got the Metz 64 AF-1 speedlight...but I'm already considering returning the Metz because I'm just not a fan of the touchscreen - I think I prefer some actual buttons for whatever reason... Anyways, but now I'm wondering if a TTL flash is even really necessary to consider, and so I'm curious how any of you folks who do event-type photography go about using your flashes, and what settings you use. What Speedlight do you own/use? Do you TTL or Manual? How powerful of a speedlight do you think is really necessary for most event shooting? thx!