Basically, what the title says. I've been a T&S fan since "If It Was You" era (I'm getting old). I read the book, of course. I honestly didn't have super high expectations of the show and was just gonna watch.
I gotta say, even if you're not a T&S fan, it's great and worth watching. It's a very under-done snapshot of a certain time, place, and experience in life (growing up gay in the 90s). The pacing is good, the music and style references are on point, and the acting across the board is a solid A- (the twins can be a little awkward and stilted at times but I forgive them as this is their first foray into acting, ever. They're doing great).
My mark of a good TV show is if I watch it without any other distractions and if I look forward to it every week, and I gotta say, this show hits that mark perfectly. I've been a Tolkien fan way longer than T&S fan, and uh... That Show is not hitting that mark for me at all.
TLDR: great show, if we ever get a second season (navigating the late 90's Canadian indie music scene and becoming adults? YES PLEASE), I bet all of my extremely minor gripes are fixed.