There are a lot of good museums in Berlin that are either free to visit or charge a small amount.
This is not one of them.
First of all, there is an enormous amount of text plastered over the walls and it's just impossible to read it all, particularly when it's busy.
Then, there seems to be very little organization / structure within the museum.
It was not a very inspiring experience.
Also, there is a charge for the toilets within the museum after just having paid 12,50 entrance fee!
I would recommend to just view Checkpoint Charlie and The Berlin Wall Memorial at the Bernauer Straße.
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