There's one TEENSY problem…
Apple seemingly alter something that prevents 3rd party cables working with each new itineration of iOS. I've got some 3rd party cables from a company called Twisted Envy (sounds more like the name of a nu-metal band) and, whilst they worked perfectly with iOS 7, try to use 'em with 8 and you'll get the 'this cable is not certified…" message and your iThing won't charge. If I stick one in my Air 2, I don't even get the popup, just a blunt 'not charging', where the battery life percentage should be.
The only 3rd party manufacturer which HAS cracked it is Belkin, as I'm using 2 of their UltraFast chargers as I type this, one on a Touch still running 7, and on this 'ere Pad running 8. I wish I knew how they worked coz it's cut charging on the Air 2 from <20hrs for a full charge with Apple's brick, to between 2 and 3 (2.5 is typical). It's 12W vs 10, so it's not as though it's that much more powerful.
Yeah, I know Belkin don't count, but I'm still in awe of this thing.
If anyone's interested, it's an UltraFast 2.4, cost £25 from Amazon. If you need help, tweet @BelkinCares, otherwise you're calling India. But you probably knew that…