I have never seen someone use Tachyon Beam or Energy Siphon in eSTFs, and I have played 1000s.
I use Tachyon Beam to great effect, however I can't really see it because I use Tractor Beam with it. I see some people use Energy Siphon in STF's. One guy was using it on the Tactical Cube the last time I did Infected. I don't play elites though.
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Please also note how due to mass nerfing how useless all these skills STILL are...
Energy Syphon does share with the Breen Energy Syphon however.
I use Tachyon Beam to great effect, however I can't really see it because I use Tractor Beam with it. I see some people use Energy Siphon in STF's. One guy was using it on the Tactical Cube the last time I did Infected. I don't play elites though.