Both the Teslong and the Lyman will reveal all that most shooters want to know about their rifle bores--or shotgun or handgun bores, chambers, cylinders, etc. Or even the insides of cartridge cases--anything that we normally can't really see.
If they'd been around when I bought my Gradient Lens Hawkeye bore-scope, at least 15 years ago, might not have bought it. But they weren't, so I went ahead and spent the money, because at the time it was the only realistic solution. Since have upgraded to the next optical generation Hawkeye, and it does indeed show more detail than any digital scope I've ever seen--except perhaps the one in Dan Lilja's shop, which cost even more than the Hawkeye.
