These are my personal opinions based on my background and training experience.
To quote directly from their site:
The Virtual Hacking Labs are for beginners and experts who want to learn and practice penetration testing in an easy accessible virtual lab environment. For anyone that is new to the subject of penetration testing we provide a tailored courseware manual that covers all subjects from the basics to help you with your first steps towards becoming a penetration tester. Seasoned experts will find challenges in our state of the art lab environment with vulnerable by design Windows, Linux & Android machines.
Visit their website at https://www.virtualhackinglabs.com/ for more information.