9°C, sunny with showers.
I’ve tested the new kettle today. The new one, with a heat-exchanger on the bottom promises faster boil times. Cold mornings can be a problem on a camp because the low temperature dramatically affects the time it takes to make breakfast. Maybe like me, you really want a coffee first thing to start the day.
To test these pots, I put 400ml of your at the same temperature. I timed each pot to the point when steam appeared when I hit Stop on the stopwatch. The stove is a Primus, the type with a hose and a loop of pipe that is pre-heated by the flames.
Here’s the results:

Plain kettle.
3’10”, 130g.

Heat-exchanger Kettle.
2’40”, 250g

Heat-exchanger Pot.
4’10”. 280g.

I’m a bit worried about the last result. The gas can chilled so much that it froze to the table. Gas pressure drops away dramatically when cold. This may have lengthened the boil time despite the heat sink.
Here is a close-up of the heat sink in case you’re wondering what it means. The idea is to increase the area in contact with the flames. This folded metal has a larger surface area and also channels the hot gas along the pot’s base.

In conclusion, I think the heat-exchange pots are worth having for the boil times. The only disadvantage is the extra weight.