Thus, the keyboard really is universal and is not on iPads (and still to a certain series) is limited.
I myself use namely an iPad Air, but still next to an Android smartphone with two devices, the keyboard is easily coupled (via switches).
In terms of size, it fits perfectly with my iPad Air, it has the same width and fits very well in the slot provided for upright (tiltable in two stages) putting down, even with SmartCase. But my Smartphone fits in very well. The construction is so well thought out and should mE with other tablets have no trouble. The lid can be removed from the keyboard when it's disturbing, it is held in place magnetically.
Through the lid, the keyboard can be easily transported in a x-any pocket because the mechanism is protected against the ingress of crumbs and other debris. After opening it is turned on, folded it is turned off. Additionally there is a button on the right side.
The buttons are big hands naturally very small and at first you have to take when writing a few typos, but you can get used well, I think. There are all the keys of a standard keyboard (of course with no numeric keypad) exists and where you expect them. The huge advantage in the operation are the keyboard shortcuts and navigation buttons that are now available in full and sometimes make you forget that you have but with a touch device to do so with screen operation. There are also special buttons for volume, the search and the lock. Under the housing are two rubber strips that prevent slipping while typing effective.
But there is one drawback, which I still do not know how much he will annoy me in the future: the lid is covered with black rubber, which, although the optical quality and the grip increases, but the dust, hair and other particles like a magnet attracts. After a short time the surface of the lid looks filthy. This really should not be now.