I have had several borescopes, including pro grade Olympus ($20k).For my current needs, this Vevor unit is awesome.
The small camera size and maneuverablility allows the visualization and close inspection of very tight areas. The latest job was the troubleshooting of an automatic transmission where we needed to inspect the area under and around the valve body,
The camera was able to navigate through holes and bores, giving us a high resolution view of its condition.