Quick update, I only used the stove once, but was certainly impressed. Just gave it a good few pumps and held a light to it. There was not the flashing light and huge fireball I had half hoped for, just a small small fireball and only mild cursing was called for.
Once in use it certainly boils the water quickly and also seemed very stable. Some of the smaller gas stoves are always a nightmare to get stable as they seem to have no weight in them for stability. Not so with the coleman, had no worrys of it falling over at any point. Not sure how leakproof it is as I took a Sig bottle for fuel and emptied the stove after I had used it, but im sure it will be fine in a rucksack. Probably one of my better fishing purchases.