You can't taste caramel at the levels used if it's in water, let alone whisky.Well E150 is basically caramel so, in theory, it should be present as a taste component.
More to the point the Signatory has 3% more alcohol and is over a tenner cheaper!
Bourbon vs sherry cask matured though...
Toasted barrels are a confection too. Whisky is a manufacture d product. The whole thing is engineered. Yet caramel is beyond the pale? Get out of it.