I only read some reviews but they are a waste of time, you don't know who actually wrote them. Some of them claim they were dishonest.
That usually happens on other forums and rating sites because the competitor companies have a whole team of dedicated writers whose sole purpose is to make other companies look bad while promoting their own companies to students. The competition is that fierce in this business. I would rather that students trust the reviews that they see at ES alone. This is the only forum on the web that doesn't allow competitor sites to bad mouth each other on the forum. If the company ends up in the DND list, then it is definitely unreliable. If the independent writers here tell you to run from it, believe them. They speak from experience. If the company isn't part of the advertised companies or independent writers highlighted at this forum, then you should not trust that writer or company 100%. ES will honestly tell you about these companies because that is how we do things here.