iPad Air, what keyboard?

I've used a couple of BT keyboards with iPads:

Apple kb-works fine great battery life, not good for mobile, bulky, irregular shape

Logitech Tablet kb, works well, but a little bulky

Just ordered a Logitech Fabric Skin Keyboard Folio, had been looking at them, and one of our manuf. reps had the style with traditional keys, and it looked and felt great, much different than I expected.

What keyboards have you tried? What have your experiences been?

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