Quality of LabSim products, phone support by knowledgeable employees who answer by the third ring, students prefer the product over any other (e.g. Cengage Mindtap),

The video lessons are very well done and digestible. The fact that some info in the videos is not in the fact sheet and vice versa makes reviewing both a need. As an instructor, pushing students to review this complex material is ideal.

Almost never is one tool the only tool you can use and may need others. When you start out in TestOut you see videos by real people, you know, just like you and me, practice simulations and fact sheets. Between the three you have a wealth of information to go through, and you can go back to find out what you missed. I was impressed by it. There are review questions, practice exams and so on. I have regular books as well to go through but TestOut on its own would have gotten me to my certification.