I have many Caliburns as they are fantastic pods for flavour and vapour production. The Koko matches them perfectly and produces a slightly warmer experience with a bit more vapour due to the 1.2 Ohm coils. The flavour appears identical and I've not really noticed any difference in battery life with the slightly lower Ohm coils but I expect there will be some. No fire button is no problem, the auto draw feature on all Caliburns has never let me down across 6 months of chain vaping and I expect the Koko will be the same.
Ridiculously small form factor, literally feels like a large memory chip. Coils are interchangeable with the standard Caliburn. Really pleased with the Koko, will be getting more. Looks great in silver.