Doing a suggestion for improvement is a good way to start, correct? I registered, approved account from the e-mail I received, logged in, and after closing the confirmation tab and getting back to the old index tab I had already open, I was not logged even after a tab refresh.
So, I really think the experience could be better if either www or non-www were forced. But it's just a suggestion. I am now logged to both domains and it works fine.