Simple websites are best for low to medium trafficked sites with multiple authors and more frequent content changes, such as marketing websites, content websites or blogs. They provide a simple starting point for website which might grow in the future. While typically low cost, these sites require IT administration of the web server and are not built to be highly available or scalable beyond a few servers.
But, again, operationally it's quite strong. 24/7/365 customer support is available not only by live chat and email, but by phone. It offers free site migrations with some dedicated attention paid to making a transfer as smooth as possible. And, if you're willing to go for one of the higher-end plans, the company has put some serious attention into performance and caching.