I am currently using this service. It works almost as fast as Gmail and seems to be stable. However one problem I did have was trying to get it to forward everything to my Gmail account or change the user GUI from 'light' back to normal (it seems to have defaulted to light...I don't even know what the normal one looks like), for some reason the help file doesn't include instructions on changing the interface between the two mode and seems to not realize which one I am using.
The email works fine and I guess I will soon get use to checking 2 email accounts instead of one. It's just a pity that my uni changed to this instead to staying with the old email service that worked perfectly fine and was able to forward to my Gmail account.