As someone who had trouble choosing major and is now interested in career planning/employment trends, this site has proven very useful over the years. I've taken the free assessment many times, which I found to be pretty accurate in comparison to other career tests. I ordered the other assessments about five years ago, and have had unlimited access since. You can take them as many times as you like and save them, which is convenient if you're not really sure about your career path.You can view assessment results separately, or as a composite. I've never seen another career test site which provides those features.
In the career section, they have interesting data regarding salary and employment. You can also research what is required for various jobs and how much people make in a given area.
The site is also a great resource for choosing a college, major, or graduate program. You can see statistics on colleges admissions, popular majors, and ratings.
What I like the most is that they aren't trying to sell you something like so many other sites that provide this kind of information. You can browse the site freely without being bombarded with ads or spammy content.
I highly recommend this site if you're a student trying to choose a major or career path because it has so much information in one place and allows you to save things for future reference. I've bookmarked so many career and job websites but this is the one I keep going back to.