Eye-Fi

I wouldn't go that far as its pretty useful if used in the right application.
Not really... 1: It's really expensive, 2: it uses up your battery, 3: the wifi is so slow... it takes like a few minutes to download a photo, 4: They only come in fairly small sizes (gb) and 5:... IT'S REALLY EXPENSIVE
 
Not really... 1: It's really expensive, 2: it uses up your battery, 3: the wifi is so slow... it takes like a few minutes to download a photo, 4: They only come in fairly small sizes (gb) and 5:... IT'S REALLY EXPENSIVE

1. Yes its expensive, but its giving you an endless capacity as well, and comes with WiFi built in.
2. I seriously didn't notice a huge difference. Yes it'll use up extra battery power, but the difference is much smaller then you think.
3. No, not sure where you have that from. Photos downloaded very quick. Not instant, but around 15-20 secs - not minutes.
4. Why do you need a huge capacity, its an endless card!!
5. See 1.

You fail to see the potential. Its not really for a home user who can't be bothered to plug the USB cable in instead. For that type of user yes its expensive and there's no real need for it.

Think of a professional in a photo shoot. He/she is taking photos and its being transferred straight to a large screen computer, or tablet, at the same time. They can pretty much take an image, walk over to the computer and see it right there - without the model/subject having to move, so if the sit needs re-doing they know straight away.
A photo is taken, transferred straight to the computer while the photographer is still shooting - it doesn't slow anything down, and the photographer notices no difference in camera performance - and is available for viewing straight away - as the photo is transferred its removed from the card. The card almost acts just as buffer to hold images that are being transferred - hence no capacity limit to the card and its being cleared at the same rate images are taken.

That doesn't make the item crap. It makes it useful in the correct setting. It depends on your uses. Ive had one. I know the potential for it, although I didn't use it as Im not a photographer so couldn't apply it in the correct environment. Too many people think of using it as a normal card, filling it up, then transferring images wirelessly. Thats not the ideal use for the card. You need to be transferring while you shoot to make proper use of its features.
 
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