>>Shouldn't "ui" be pronounced like "oy"? It's been decades since I've been in the Netherlands, but I seem to remember that much (and I hope not wrongly :).
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>Like oister ? Well, not exactly but it is the closest I can come up with. The 'ui' is something I never heard in another language (not even german who indeed would pronounce it like 'oi'. Meybe it is closer to 'eu' from euthnesia. But again it is about imposible to describe in words how it should be pronouced.

You obviously know your vowels - I did hear this "pronounce it as oi" from a German :).

There's just a few things I managed to learn - how to pronounce the throaty G, to pronounce v as somewhere halfway between f and v, and that s should be a bit softer, with a slight sh-ish echo. As for vowels, a Dutch sailor once told me that it's actually quite simple, there are five vowels (unpronounceable list here), but it becomes complicated with the five diphthongs: a, e, i, o and u. That's where I understood that the coordinate system is substantially different :).