Mine came today.
Tried it out and looks really good and clear.
I haven't seen the Hawkeye borescope at about $750, but for $50 this looks good.
I've been looking at Ren's first posting regarding the accurateshooter website as well as the Teslong Forum Thread which is a link in the article.
Gotta look at lots of barrels to figure out what to look for.......... lead fouling, copper fouling, rounded lands, etc.