Is WiFi on the F800EXR of any use?

A somewhat related question, for those who have had/used the wifi sdhc cards: do they work reliably? My thought is to use one solely because I'll often be shooting someplace and would like to deliver the invariably asked-for copies right there and then -- but people often do not have a card reader on their machines and I usually don't have a USB adapter.

My sense (read: hope) is that these come up as another network connection, to which people can hook up, then open the card in their browser of choice, then copy such pictures as they desire, then log out.

Is this even remotely close to accurate?

If it is, then which if the cards is best, both for reliability and for low drain on the camera's battery?

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depscribe
some pictures: http://www.flickr.com/photos/depscribe/collections/