The problem for tether is lack of transparency. We all know Tether is completely centralized, and Bitfinex said it's backed by the real USD value but we didn't know how the way it's exactly works. I love to hear more about the scheme of it. But personally, I'm will stay away from Tether.
However, I'm using tether. I don't care about its lack of transparency. I ignored all of the Tether FUD. Tether good for trading since its backed by the dollar. Because Tether has the cash in reserve and appears stable.