Some people might look at the larger iPad Pro as "the iPad that has keyboards and a stylus." Well, actually, any iPad can get those things too -- maybe not quite the same, but good enough that the average person will be super-satisfied. My favorite used to be the Logitech Ultrathin keyboard, for its pure portability. But the better choice if you have a new iPad Air or iPad Air 2 is the Belkin QODE Ultimate Pro keyboard case. It's $150 (£149.99 in the UK, or AU$200), and if you're a major iPad-writer, it's worth it. The keyboard acts as a lid for the Air 2, while a back cover protects the whole thing for easy travel. Belkin sells two different versions for Air and Air 2, to fit their slightly different tablet thicknesses.
First of all, the keyboard feels great. I've typed on it furiously, and written whole articles on it easily. The keys flex a bit, but the layout and responsiveness are top-notch -- and I'm picky. The keys are backlit, too. The case can be adjusted to two different angles, all magnetically, for working at different places like cramped airplane tray-tables.
The case auto-pairs the moment you open it, and the keyboard bottom half can be detached from the top-half case -- again, thanks to magnets -- to use the case in a basic protective, non-keyboard mode. An iPad will work in landscape or portrait mode while in it, and even better, the keyboard will pair with other devices if needed: up to two at a time, switchable from the keyboard. The keyboard charges via Micro-USB, and gets enough battery life for a year of use. I've never needed a recharge.
The Pro model is the best for its backlighting, and I think it types a bit better. I like the Pro better than Belkin's recent Slim model, which feels cheaper and doesn't type quite as well. The QODE Ultimate Pro is now the case I use almost all the time, and with Apple's new iOS 9-specific keyboard shortcuts it becomes a damn useful on-the-go tool, too.