I have a Lenovo Ideapad s10-3t tablet netbook. While this is a good keyboard in landscape mode, it has glitches in portrait that make it unusable. When I launch the keyboard, it stretches off the screen rather than resizing it to the size of the window. If I then maximize the Firefox window, it actually forces Firefox to stretch to the fixed width of the keyboard (which is significantly wider than my screen in portrait mode.)
All-in-all, this is a good sound OSK (On-Screen Keyboard), my problem is that I need an OSK primarily for portrait use. If I need a keyboard in landscape I just use the physical keyboard. This is much nicer than the Windows 7 OSK that I use now and I will definitely reinstall if I see these bug fixes in the change log in the future. Excellent add-on.