Do you need HSS for > 1/250 action stopping or are you just trying to use a wider aperture?
You\'re kind of in a shitty situation if you ask me.
Given that you want HSS you are pretty much limited to: PW Flex and RP PX.
Flex, with AC3 would give you easy power control from the camera (I assume WITH HSS though I\'ve never looked into that particular aspect) but as you\'ve read it\'s shite on Canon.
RP PX does work reliably (from what I\'ve read... my experience with RP has been only with JRx... and I\'m not using them anymore...) with Canon but it does NOT give you EASY power control from the camera. I mean yeah you can change the power settings in manual but you have to do so through the ridiculously clumsy 580EX2 interface.
PX requires you to have an additional flash on board... so to have one flash working with PX you need TWO flashes.
...
Now, IF you want HSS because you want to be able to use wider apertures, there IS a solution you might end up preferring to the PX solution... and the price isn\'t bad either.
To compare...
PX solution:
2x Canon 580Ex2: $900
RP PX Transmitter: $250
RP PX Receiver: $250
Total: $1400
Einstein Solution:
1x Einstein 640: $500
1x Vagabond mini: $240
1x Cybercommander: $180
1x Cybersync receiver for Einsteins: $30
1x 0.9 ND Filter: $60 (Hoya Pro 1) to $175 (B+W Multicoated)
Total : $1010 to $1125 (depending on which filter you go with)
This solution would give you A LOT more power and flexibility if your goal is to shoot manual flash with wide apertures. The ND 0.9 filter would obviously give you three stops of additional aperture flexibility, and would be equivalent to having a Sync speed of 1/2000 (assuming 1/250 native).
