Absolutely hilarious and well-written to boot. Harry is a bit different on account of having to understand the girls around him a bit better, and the gang he accrues is much larger. The author does a good job at characterization, hinting at things like hidden crushes without stating them outright and making Snape downright creepy in how he's nice to Harry/Harriet. At his core, Harry is still the same person, but the different perception of his gender has changed the world around him. Male cousin beating up his male relative? Mildly distasteful, but acceptable. Male cousin beating up his female relative? Shock and outrage. It's a very thought-provoking concept.
I will admit that I'm a bit scared of how Malfoy may turn out and what he may try with a female Harry.