Protects only half, because the shell is open at the back.

The shell is large enough for a 24/26-inch monitor in any case, they can raise any problems.
Negative I feel the facts, that the envelope on the Monitor back is open. There is only the peripheral seaming panel with 5 cm width, otherwise not covered the back of the monitor.
On my ASUS 24 '' - monitor all connections go straight down away so that so protrudes no cable or USB flash drive to the rear. Even the slight angle angled pedestal is not a real obstacle to establish a not fully be covered shell, because this stand is indeed at the bottom of the screen, and thus would not hinder a full shell.
In order to completely cover the monitor, I have in the meantime bought a second, identical cover and this brought up the wrong way. Now everything is tight.