What each brings a star deduction, the following points are:
1. The contrast / black level neither adjustable nor particularly high. From medium screen brightness black text appears only as gray.
2. The device does not have a Kensington slot. It can not be secured with a Kensington lock so when traveling. That to me is already a major drawback (which was not previously aware of). You have the device so leave unsecured in hotel rooms, because for most safes it is again too large. Not even the manufacturer there is an alternative solution to protect the equipment against theft, which I think is very weak.
