I read elsewhere that they has some serious spammer problems, but also saw a reference to "health" issues, so I dont know for sure. It's gone down before for several days at a time, but has always resurfaced. The last time was a corrupt database and server problem.
It is antiquated (but free) software that operates it, but I do find the quality of the people and knowledge on there to be excellent.
Regards,
Badger