I've been with Kraken for years now. As is mentioned in the interview, they've never been hacked. I've never needed another exchange.
There are many alternatives these days.
Yes I was also involved with Mt GOX exchange previously, lost some money when a btc -> GBP transaction never showed up. I think everyone involved in bitcoin (btc) back then were doing exchanges through GOX. They were one of the few ways of changing into btc.
Very impressed with the interview, although it's long winded.