I traded with Bitfinex for a short while. Experienced and reported an issue to CS on minimum withdrawal required for a certain altcoin. I was not able to withdraw at the minimum amount they required. I was only able to withdraw about 50x the minimum amount stated. Though CS responded but technical support and I guess whole management just ignored the issue even if it was just a really simple one so I thought the issue could have even been intentional or their own doing that's maybe why no fix was introduced to address the problem. I suspected this was partly due to their vested interest on the altcoin I held and traded with them.

And I do find the Tether issue also kind of a shady deal on their part so I finally decided to look for a better exchange site.