I found a bottle Of Jack Daniels Single Barrel Barrel Strength today. The little corner liquor store by my house turns out to have an amazing selection of the various specialty JDs, including the very rare Eric Church.
Anyhow, this stuff is 131 proof. Neat, I can barely get past the medicinal smell as it sets my nose hairs on fire. I can't taste much of anything.
A big splash of water opened it up, and revealed some surprising complexity. Neat, it was undrinkable for me. A big splash of water and it's still quite... vibrant, but tasty.
I mixed myself a boulevardier with the stuff at full octane and hard a hard time for a while, but oddly enough, the more I drank the easier it got.
Anyhow, I'd recommend the non-barrel strength over the hi-test. It'd be more user-friendly.