I have a lot of problems with the program hanging. I've used IE, Firefox, and Chrome and have tried it from different computers. The results have been the same, but inconsistent: the site seems to freeze or hang. At times it is unusable, but other times it runs slowly, but well enough to make it usable.
I've considered upgrading, but I can't see paying for the premium if the site is so slow as to make it not practical.