When I say "not canon rehash" I mean it doesn't stray from canon, but the focus is really not on it, so you don't get bored at all.

Slytherin is realistic. They're kids. Slytherin kids, but kids.
Ginny's voice is... really well done.
And she doesn't become overpowered (even if she's not weak) as is easily found in Slytherin!protagonist fanfics.
I got really attached to the characters.

Really, give it a try.