I was surprised to find this deal on my Inbox. I already have a hosting account with FatCow that allows me to host multiple domains with unlimited space, unlimited MySql databases, and unlimited Mailboxes and recently found out it supports CakePHP, for rapid PHP web application development. I already have multiple WordPress blogs hosted in my account. So I can tell you by experience that I really like FatCow.
I never had any issues with the sites being down or slow. I needed some help to do some crazy htaccess setting and their support was fast in answering my questions.
FatCow recently updated its Control Panel. Now is even more easier to point domains to sub-directories without having to do it manually. Also setting up any number of mailboxes is now much easier.