As good as the iPad's on-screen keyboard is, a lot of folks find that using a proper keyboard makes typing long emails and documents on the iPad a lot less cumbersome... and almost enjoyable! Logitech's Solar Keyboard Folio goes one further, by combining a solar-powered Bluetooth keyboard with a case. you slip the iPad (2nd, 3rd or 4th generation) into the holder and it folds flat against the keys when not in use - i'd advise against putting too much pressure on the back so that the keys stay away from the screen. Seems like a bit of a design flaw, as does the lack of a lock to chose the case, due to which the Folio has a tendency to open up when inside a bag. If you liken the Folio to a dinner jacket-meant to look smart, not meant to be rough-and-tumbled-you'll be okay using it.
They keyboard by itself is excellent, with keys providing a satisfying amount of travel. Add to it the solar charging capabilities, and you'll never have to carry extra cables or chargers. But like most things solar, the price is a major downer, and I suspect most of us would just settle for slightly sturdier keyboard case.