They are not going to recommend any other subwoofer are they? There will be always be a bias if you call a manufacturer.
No, I would not expect Rythmik to tell you to buy an Epic.
However, I do expect them to suggest the best option among their own models so you are comparing their best option against the competition.
If you are looking at a Rythmik and really want the best sound
for music (and I am assuming your room is not too big for two F12G's to fill, that is a better option than their 15" model.
They are not real quick to point this out because they realize many people just want a 15" sub - for bragging rights, or whatever.
I do believe their 15" sub offers outstanding fidelity.