Actually, the US is one of the only countries where you can buy Vegemite! They tried to establish it in Europe years ago and failed miserably because really, only Aussies and N-C-landers like to eat yeast-waste on toast (no offense )
I tasted it ones. And had to declare it the worst food ever - like pretty much all non-oceanians. To me, it tastes like soup stock. Imagine a spoon with artifical vegetable stock powder on it and with approx. 10g of salt and you know what Vegemite tastes like.
I only had an american style cheesecake ones but ye it is similar. They also do use cream cheeses (Phiadelphia-cheese style) and custard cream which gives it this gooey texture, it's rather weird (for my tastebites). I know that you can buy Quark in some big american cities (which is surprising because you can't even get it in the UK, which is so close) but it's a milkproduct and therefore not vegan :/
I know, but I'm so curious about the differences between cheesecakes in different countries! I don't know why exactly. I love cheesecake. There is a restaurant where I used to live that made amazing vegan blueberry cheesecake, but I normally hate when stuff is added.