Ok, so I just got to the part when Jean-Louise got to the courtroom and finally 'saw' her father as he really was... except he didn't. Since this book was written BEFORE TKAM, then it doesn't really go with it since I'm sure Harper Lee changed many things when writing the first one. 
 1. For example, in TKAM, Atticus was ASSIGNED to defend Tom Robinson.. he didn't CHOOSE to do so because Calpurnia asked him." 
 2. Mayella Ewell was NOT a mere 14 years old, as in this book. In TKAM she was NINETEEN. There was no rape by Tom Robinson, she kissed him. It was her father who had had his way with her many times since there was no mother. 
 3. Atticus CRIED in the final court scene in TKAM. He wasn't so disgusted he had to go home to bathe." 
 4. These are obviously two different characters (Atticus TKAM vs Atticus GSAW), since it was probably directly published and Harper Lee didn't (or couldn't) adjust it to what she had written in TKAM, so the two stories contradict each other. Therefore, I don't know what all the noise is about... this isn't a sequel, but probably the exploitation of a little old lady who might not even understand what is going on. 
 Having said all this, I am still enjoying it since it is 100% Harper Lee's writing style, which is refreshing to read after so many years.