The Willis type that you referenced. I have not direct experience with that particular unit but it is very similar to the various units that are being sold for automotive use.
I have tried several of those units, Snap-On and Matco. Both have unique features that allow you to take still pictures as well as voice over video. Only problem is that their screen resolution is not all that great. Also, in order to see the actual surface of the lands and grooves, you have to install a clip-on 90 degree mirror. I would check the diameter of the mirror and fiber optic probe and make sure it will fit down your bore.
The tool salesman indicated that you can hook-up the scope to a laptop for better resolution but I could not get the units I had to do that. Might have been me as I am not all that computer literate.
All that said, I purchased a Hawkeye with the 90 degree attachment and have been tickled ever since.
Bob