I have this keyboard. I was windows 8 curious for a couple months last winter, man that was a bad it me in my life
The good
It's very compact and well made. It pairs easily and it wakes/sleep when you take off/put on the really nice cover/stand it comes with. The cover/stand is very sturdy and folds to prop up the ipad if you have no way to otherwise. It does not lose connection and I've had it for about a year and haven't changed the batteries yet.
The bad
It's a little heavy with the cover. Some of the shortcut keys at the top work with the ipad like volume and play/pause track shortcuts, but not as many as any keyboard built for an ipad. It's also a little cramped. The angle of the keys around the edge help but honestly the on screen keyboard on my air feels less cramped. Keys are a little slippery and hard to find since they are so close together.
Overall it's very nice if you don't need all the shortcut keys. Well built and can take travel admirably.
That said, I don't really use it and prefer the on screen keyboard. But I'm really good with the on-screen keyboard.