It rips of Newgrounds in the name, and is pretty pointless. emails aren't that bad, can be accessed using a program on your PC (no loading internet pages) etc
"3) to deliver your private messages instantly - emails take a few seconds, even minutes of high traffic. PM's are always on the same server, so no wait is required. "
One of the key selling points of email is that it's virtually instant, especially compared to the post. No wait? Are you the kind of sad git who refreshes their inbox every second?