I never tried this exchange site before but it seems legit because I found a thread with the same question check it here https://bitcointalk.org/index.php?topic=3168670.0
According to some reply that they already traded on the exchange without any issue so the site might be legit.

However, if you are planning to exchange your coins in Coindeal exchange I suggest you deposit a small amount first to test before you exchange all of your coins.

Another information that I got is that the site doesn't have owner's information and the owner of the domain seems 2nd hand owner and I heard that someone experience delayed deposit and withdrawal confirmation. So for me, Coindeal is not 100% safe.