For me the Carnac didn’t test as well as a bontrager velocis, kali tavo, or BBB tithon. And those helmets aren’t TT helmets so that gives you some idea. But if you like the original bambino I’d say it’s comparable.
The more I test and participate in other folks testing the more I’m impressed by how different helmets can be depending on the rider…one ubiquitous helmet that seems to be pretty good on every head is the bell javelin. Not the best but always better than just an aero road helmet & pretty reasonably priced.
The bambino might be good on some heads but on mine it’s worse than just an aero road helmet.