Twenty-one dollars for a whole year of web hosting on a fast non-oversold server is a great deal. Other provider's unlimited plans will often require you to sign up for multiple years to get their discounted pricing. We, however, don't think it's a good idea to be on the same server as someone who needs unlimited disk space and bandwidth. We think you'll agree.
In our experience, one gigabyte of disk space is more than enough for most websites. If you need more, you can upgrade to our higher plan at anytime. But in the meantime you're not paying for something you don't need just yet.