Lightweight -very little more than the weight of the batteries alone.
Decent length of cable from pack to flash - no restrictions on movement even if the pack is on your belt and the flash held above your head at arm's length.
Smooth contours which don't snag on clothing when rushing a shot.
Plug to flash seats extremely firmly and seals with rubber ... Read more
-It holds lot of batteries.
-the cartridge is sturdy
-very well build, no squeeky plastic etc.
-large and looks cool :)
-Fits with a small "click" on my 580EX II.
-weathersealed connector (not the pack).
-fast release switch for the cartridge.
-really gives a good jolt for the 580EX II.
-it clicks very gentle, sounds kinda ... Read more
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