The i60a is the perfect size for an on camera setup because of its size.
The i60a would be the perfect small/powerful setup for weddings with TTL capabilities. I am new to speed lights that don't require a receiver/transmitter combo and I love it. One less thing to worry about setup wise and one less thing to have batteries for .
I think HSS would be more "perfect" for wedding applications. I highly doubt the max flash sync is much help for extremely bright sunny days limited without HSS. Sometimes you just need enough light to fill shadows in harsh mid day sun.
I still haven't tested my EF-X500 thoroughly but it's certainly reassuring to have HSS. I've been waiting for Nissin for full capabilities of HSS and it has not happened yet.
One thing I must say is buying a flash for fuji is imperative for maximizing general usage. I've been pushing the "natural light/available light" shooting and it just didn't work for me. I'm so use to "double exposure" LOL!!! In a fun way I mean able to control both environmental available light and artificial light light controlling what I want.
One thing I mentioned on another Fuji thread is that fuji's flagship flash uses an LED focus assist rather than infrared like my Canon. I will have to say it appears OE and 3rd party use this method of focus assist. Obnoxious bright white LED is one thing I cannot accept as this is an inferior method of locking on AF in darkness especially low contrast dark subjects.
However at the end of the day I'm extremely pleased on finally purchasing an OE HSS capable flash. My next test is to shoot in bright sunlight in the lens while pushing HSS to uplift shadows of my subjects. This is what I've been easily been shooting with Canon and now I can finally see if it works with my Fuji.