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I've got the amex business platinum card.
The main additional benefit is airport lounge access.
I'm an independent contractor with my own limited company. I tend to do a lot of international travel where I'm dependent on the clients choice of airline / travel class.
In my circumstances I consider it a worthwhile business expense to make long haul economy flights slightly more bearable.
Another question - I have an AMEX card to put work expenses on, it works well for this. It's a gold charge-card, and I pay an annual fee for it.
AMEX keep nagging me to upgrade to a platinum version of the same card, for an additional £300 fee per year on top of the existing charge - personally I can't see why I'd do this, but clearly some people do. What am I missing?