As said above, this is a knock-off of the older Kask Bambino. I actually tested this helmet against a Selector, then a Tempor. Of course, helmet performances are highly dependent on your head's position but this'll give you an idea anyway...
With the Chung method, the Krono was 0.005 faster than my road helmet, 0.005 slower then a Giro Selector and 0.013 slower than a Tempor. You'd roughly gain 2'20 seconds over 180km at 28kmh with a Krono, compared with a normal road helmet (according to this calculator http://www.aeroweenie.com/calc.html).
Also consider the ventilation of the Krono, which is below par. For an IM, I'd personally opt for an aero road helmet. ;-)