In 2016, my entire balance on my bittrex account was stolen, after that I stopped using it. However, it is an exchange that has tightened and strengthened its security measures in the last few years.
An exchange that has the capacity to be among the top 3 most voluminous exchanges, but the biggest obstacle to this is being unable to trade without mandatory KYC approval.
It really has a lot of trading pairs to trade, which makes it preferable. It can be annoying at times as a lot of confirmation is required on the deposit part, and the deposit time gets longer.
It offers the opportunity to trade directly with fiat currency pairs such as USD, which is nice but fiat currency pairs can be further increased.
As for the support department, they don't help much lately, they usually give more general answers rather than personally, which makes people a bit cooler.
However, I can say that it is a very nice and useful exchange, except for 1-2 problems such as support and mandatory KYC.