Continuing from earlier on, my mate did a side-by-side run of Colibri and Vector today using some old groggy material since testing etc..
Vector (300ml can) came out as a pull n snap kinda thing as expected, tasted as it should.
Colibri (90ml can) came out distinctly more waxy-like, had a definite chemical-funk taste to it.
As mentioned the snap-fit lip around the top of the cans seems to have a slight dried residue/oil looking substance around it.
I've used Colibri in the past (only 300ml) and had fine results, as have many others I'm sure.
Could it be a dud case?