Be careful about Bitfinex, one of the exchanges that have been discussed here. They are using Tether to finance their day-to-day operations, which will result in trouble down the line.
Reference: https://hackernoon.com/the-curious-tale-of-tethers-6b0031eead87
This PSA is only because I know Jeff has mentioned BFX without this particular footnote, and I want new investors to be aware of the potential risks.