I took a quick look at this site, and perused a few family group sheets for a President, a governor, and a Mayflower passenger (and a few of their ancestors). All of these had sources, a mix of both primary and secondary sources, such as some of the prominent journals. Some of the secondary sources I am familiar with, and are considered reputable.
One thing I did not see was any link to internet family trees, ie, Ancestry.com trees. I will admit my sample was small, but on many, many sites these so common.
Thus, my first impression is positive.