Website: http://www.pdhengineer.com/
State approval: Map with links to each state’s requirements. A copy of an approval letter from the state of Maryland is provided.
Fee Structure: Generally $30 per credit hour, packages are available. For example 18 credit hours for $399
Ease of use: Clean looking web-design, even though there is a lot of text. Many menus and sub-menus make it very easy to navigate
Course variety: A lot of courses.
Course materials: Spot check of materials indicates that courses were written for pdhengineer.com. All the materials I saw were copyright 2010 or more recent. Most were 2012 or 2013.
Course instructors: Need to click through to identify instructor, but for the courses I spot checked it seemed like there was a large variety of instructors
Course ratings: Available, but few courses are rated.
Course packages: Available, pre-selected and customizable.
Personal experience: I took a course through this company the last time I renewed. It was titled Groundwater Vulnerability: Providing Scientifically Defensible Information. It looks like it is no longer offered, possibly because they update their courses on a regular basis.
Preview course material: Yes, a partial preview is available.