If I own Realivox Ladies and Alchemy Dream Voices, is Ethera redundant?

[KeithAdv]

Subject says it all!

[cfanyc]

and may I add: if I own Ethera does Aeris add major value?

[Aloysius]

I think that's a bit like asking ... If I own samples of a Roland TR-909, does that make all other Drum Machine Samples redundant?

If you like the sound and functionality of Ethera, then, no, it's not redundant.