I used business shared account on hostgator for years with no problems until an "upgrade" my account killed all my services. Raised a ticket and got a reply days later and of course the guy hadn't read my email. Raised another ticket and he promised to get someone to help me but I gave up after a week of my sites, databases and email services being offline.
It's great when it's working but do a search for hostgator sucks or have a look at the Wiki entry;
http://en.wikipedia.org/wiki/HostGator