I use the Apple Wireless Keyboard with my ipad - have tried a few others but none came up trumps for me personally.

Battery life is good and the size isn't as much trouble as you might think.

I picked mine up on a whim really at Dixons T5 - I was struggling to feed my 'must buy something from Dixons T5' addiction when I happened upon a pile of these in the corner - think it was £50ish - turned out to be a good investment - unlike some other things I've randomly bought at that store in the past!