Not schleht ...

The idea is really good, the implementation / quality could be better - cheap plastic version, the little 'rattle'. (I would be quite willing to pay more for better quality).
The trackball is relatively inaccurate, perhaps that is better but for a little more exercise.
The relatively loud clicking of keys bugging me a little (I am silent mice and trackpads used).
. The LT packaging existing laser pointer works with my copy is not, the red light can be seen only by the scroll through - but I do not care, because I do not need to anyway.
Conclusion: very handy as a remote control for surfing / TV when lying around somewhere, and no decent surface for a mouse is present, and you do not need keyboard - but nothing more.