Bought it yesterday and it couldn't connect to servers on my mac.
Something is definetely wrong here:
[00:00:05]: [Steam] Got Auth Session Ticket
[00:00:08]:  Account Failed (3): ""
[00:00:08]: [Warning] Empty error code received, dumping response:
<head><title>404 Not Found</title></head>
<center><h1>404 Not Found</h1></center>
Launch app Press play