I had a long-running error with the UK android app -- it had stopped working entirely, so I couldn't log in.
Hundreds of messages to support only returned mostly canned text -- making me think many of their support "people" are poorly coded AI bots -- and infuriating circular answers. Dozens of requests to escalate to someone in authority only returned canned answers. I eventually wrote directly to upper management, to my surprise they responded and my account was quickly reset and I was able to use the web interface to withdraw.
Of course this resolved the day before the multisig drama, so I waited that out patiently.
There do seem to be ongoing problems,
1) fake volume being one of them (which seems a common ploy
https://cryptobriefing.com/hitbtc-insolvent-scams-users-cybercrime/ and OKEx has addressed it)
2) it does appear they're using coded-by-non-English-speakers AI bots positioned as "real" tech people for English-language support. Alternatively, they're rapidly on-boarding tech personnel with specific instructions to respond quickly, if not intelligently, to placate people frustrated with wait times.
3) Their founder has, at the least, put his name on other projects of questionable ethics and "ponzi-like" structure. Could just be a quest for rapid growth and other peoples' fraud ensnaring him.
But in the end the current management seem up-front and they do seem to be trying to run a legitimate, secure exchange. On thing that lends to this conclusion: Their CEO is an American citizen. Penalties for crypto/cyber fraud there are severe, and America projects it law enforcement authority worldwide, I just can't see an educated, intelligent person taking this high-profile job if he couldn't ensure it was legit.