I've never heard anything good about Mantequilla, TN or otherwise, but never anything specific (other than tight draw maybe). Someone gifted me a natural torpedo a few herfs ago, and it was rather good. The burn was great, the draw was fine, and the flavor was middle of the road tobacco (sort of like a Hoyo in an old school standard kind of way). I haven't had the Tapa Negra, but my somewhat oblique experience would lead me to think they are at least worth sampling, if not exactly jumping on a box right away.