I finished this a few days ago when I was recovering from the worst of my allergies, so now it's been longer and I don't remember all the details, but I should be able to wing this well enough.
If you like the G3 show, you'll enjoy this book. It stars Frankie, though other characters have pretty big roles. I actually found Laura and Clawdeen to be written a little annoyingly. They're better on the show. However, the author makes up for it by absolutely nailing Twyla and Manny, who played a pretty big part in this.
I am happy to note that the cover scene does not take place. Clawdee0n and Draculaura do not spontaneously play instruments. I really hate when shows have their characters who have been completely not musical before suddenly start a band and it's like everyone has been playing for years.
Frankie does play keytar, but they do in G3 canon already, so that's fine.
My biggest nitpick is that the author needs to familiarize with the characters. She completely botched hair color not once but multiple times. Spectra is described as having white hair. Uh, not even close. Clawdeen has purple and...pink? That's light brown! Why would you even write about characters without LOOKING at them?!! I think she said Laura had black hair, but later on mentioned pink, so I'll give leeway there, but seriously, if you've been hired to write about characters that aren't yours, take a few fucking minutes to learn about them. Seriously.