Cannot give a recent feedback (stopped trading there almost a year ago), but at that point HitBTC was pretty reliable.
I guess they lack manpower in support area - had some coins stuck for a couple weeks with minimal response from support team.
Also I'd like to point out their API - out of exchanges where I've traded (kraken, bitstamp, binance, deribit, bitmex, huobi, okex) - it's most 'complete' and close to traditional exchanges.