I've sent ETH to convert to Bitcoin, and it's been stuck at "awaiting deposit" for the last few hours. I've used them before but for much smaller amounts. I normally send around $500 max but this time I've send around 1.5k to be converted into Bitcoin and this time it's taking forever to deposit when other times it's been instant.
No they aren't since lots of people been using this site for quiet long time now and they are legit. Your exchange took so long because of congested network either both ways. Bitcoin and ETH do have lots of unconfirmed transaction so as expected it would really be delay but one things for sure it would really be credited soon as long you do already make the transactions. If the exchange have been completed but not credited into your account you can anytime email or contact their support. They are really responsive.