It all depends on what your needs are out of a borescope. A gunsmith or Match shooter will have different needs than a hunter who isn't going to shoot out a barrel. I can't tell from the video if the Endosnake will work even for copper buildup. The guy didn't turn down the brightness enough to tell.
The Lyman does all I need with no wishing I could see better with a more expensive borescope. I bought 4 used rifles last year and on one it had a carbon ring that was causing some accuracy problems which was easy to see. Despite the carbon buildup, it only had minimal fire cracking considering the age of the rifle which would probably be harder to see using the Endosnake.
As for copper buildup, some copper is desirable and you need a quality scope if you are looking to judge how much to leave or how much to remove.
My opinion is that a cheap borescope will just make you want a better one. I can tell a difference among the 14 rifles I have used the Lyman on. It does show the differences between Shilen, and McGowan match barrels I have compared to Sauer, Bergara, Browning and others I have. More or less tool marks the main thing. Of all I would say the McGowan and Bergara appeared to have been lapped the most.
