Pros: This really does get into some tight spots with the long length, small head, and light on the end. The color camera is nice too.

Cons: The display works best when mounted to the unit. I noticed a lot of white horizontal lines of interference when it was detached, though I could certainly still make out the image. I don't know if this was from all the wi-fi in the house.

I noticed the video and light kinda' cut out when wiggling the length, maybe a bit of a loose connection.

Other Thoughts: This works much better in daylight, or with supplemental flashlight. When I took it into a dark room and laid a piece of paper on the floor, I could barely make it out at 3', at 2' I could tell what it was, at 6 to 1 inch I could read it. Closer than 4" it actually starts to magnify. But in a well-lit room it could see the paper on the floor from over six feet.

So if I were trying to look into a wall cavity, I'd want to be able to shine a light in also to see all the way.

I noticed the image wasn't "square to the world" which made it tricky getting your bearing, but when I put a paper square to my feet, I was able to twist the length until it was square.

This seems best at up-close work. At 10 or 20 feet, you can make things out, but they're fuzzy. It's not really for poking up into the attic and looking around. But looking under the fridge I saw how dusty the coil was. Or with some extra light I spotted things behind the dresser. It's a bit tricky getting used to up/ down left/ right. And a bit of trial-and-error getting the bend just right snaking it thru to find the A/C drain on the car.

They say it'll fit into a spark plug hole, but I think it's only look straight in unless the piston is all the way down being that the first two inches are solid

1" - 6" is where this excels, and it's acceptable at further distances with supplemental light.