It looks ostentatious, ridiculous idea. Bulky, lack of hygiene, too expensive for the purpose and it is not required.
Hygiene? Short of putting on some sort of anti-bacterial body wrap before entering, one is exposed to all sorts of whatnot from the moment they open the door, touch the magic trackpad beside an iMac, run their fingers all over the face of an iPod Touch/nano, iPhone, type on a MacBook, or pick up the "paper in plastic" product info placard, etc., etc.
The use of iPads for this purpose (though I agree is a bit ostentatious) is, to me, no less hygienic than anything in use the day before.