Off the record,
back in the past when fakes were starting to surface, a foolproof
way of differentiating the fakes and originals were the sound
quality, a sign of lousy components and cheap parts.
However, as technology gets cheaper and cheaper(and I mean real
CHEAP), the components used in fakes can be the same as those in
the originals, leaving no flaws for comparison sound-wise.
But if you really need to know, ask those who have bought it by
just asking a question. I'm sure they'd be glad to share their
opinions. Honestly, I can't tell the difference in tonal quality
unless it's the bass.
And if you're curious as to why it can be sold so cheap, I believe
the first 2 paragraphs answers that question pretty effectively and
in detail.
Hope this answers your doubts.
Regards,
Zhenjie