It’s a mixed bag. Honestly, they're just selling ripped copies of Factory Service Manuals (FSM) or data dumps from Alldata and Mitchell.
If you have some patience and just need cheap access to factory torque specs and wiring diagrams, it gets the job done. But if you're expecting a slick, user-friendly interface that works flawlessly on your phone while you're wrenching in the garage, you're gonna be disappointed.