Hey! I am pretty sure I have used bittrex since 2013, although I have to admit I mostly traded the coins that didn't exist on other exchanges, but it wasn't much because of the site, just that I used kraken for my daily trades.
But I am glad bittrex is one of the few clean ones who have never had anything gone wrong on a massive scale and hope the future is looking good for you guys and the rest of this technology. :)
Good to have you guys actively on here!