It is difficult to talk about the reputation of the exchange as this is a subjective opinion. Someone they may not like and someone with pleasure trades on them.
My subjective opinion is based on the experience of some people who spoke (with proofs) about these exchanges on this forum. I don't even know if I would have liked trading there, but I will not try

.
Every trader has it is personal experience with exchange. A good exchange can be hacked or it can freeze the account of trader. Today exchange is good. Tomorrow it is bad.