One issue we noted, that is not unique to this but all borescopes, is that the depth of field is limited in the camera. This means that only a certain area of the image is in focus. To get around that, you have to move the camera around to get the area you want to see in focus. It's not that big of a deal.
The EE6000 has a camera with a 70-degree field of view which is huge for a camera of this size. The field of view is almost twice that of other low cost borescopes that still cost more than twice as much as the EE6000.