I use the touchpad keyboard with my Apple iPad and my HP Touchpad. It works perfectly with the iPad also that @ sign is used (Alt + L) Just try it, all umlauts like ä, ö or ü flaps on iPad and Loud, Soft, Play, Stop However, some function keys are not occupied but not doing the important things work.
Smaller texts like this not be a problem.
The keyboard itself is really beautiful and stylish. I get these for EUR 21.50 in January. At this price you can not go wrong!