Although I love my iPad, it mainly gets used for reading, listening to music and the radio, idle browsing and playing the odd game. The only serious work I do on it is proofreading. I do all my writing on our Samsung Chromebook nowadays: it has a proper keyboard, for one thing, and doesn't get annoyed when I try to use Google Docs.
The Kindle Fire looks to me like it can do almost everything I still use the iPad for, but is much, much cheaper. If it was available here, I'd have pre-ordered one already for Mrs Theaker's birthday. (Last year I got her a third generation Kindle, and she's used it pretty much every day since.)
All the UK is getting for now is the new, ultra-cheap Kindle, which lacks speakers (so no audiobooks) and lacks a keyboard. For most readers, the trade-off in weight and cost will probably be worth it. It's down to 6oz now, apparently, which is old-timey talk for... checks with Google ...170g. About the weight of a small 200pp paperback. I think it'd be a downgrade from the Kindle I've already got (which is now renamed the Kindle Keyboard) – I love being able to make annotations with the keyboard – so I won't be getting one, but I imagine it'll do very well for them, especially at £89.