The best replacement for cybersync is pocket wizard.

The best alternatives to cybersync are rated as following:
★★★★★  pocket wizard
★★★  radiopopper
★★★  pocketwizard
★★  cactus v5

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Speaking about cybersync, one probably shouldn't forget about 580ex ii.

Other search terms related to cybersync and their ratings are:
★★★★★ 580ex ii
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Google Trends

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cybersync
pocket wizard
radiopopper