I really liked 'A Certain Magical Index Vol 17'. The story development in this volume is quite engaging. It continues to expand the complex world of Academy City and the magic side. The characters are as vivid as ever, with Touma's unwavering beliefs and Index's cute yet mysterious nature still being the highlights. It also delves deeper into the power struggles and conspiracies that make the whole series so interesting.
I found 'A Certain Magical Index Vol 17' to be a solid entry in the series. The plot pacing is good, not too rushed or too slow. It manages to balance the action scenes with the more character - centric moments. The writing style is also easy to follow, which is great for both new readers and those who have been following the series from the start. And the cover art is really cool, which is always a plus for a light novel.
Well, in 'A Certain Magical Index Vol 17', one of the most interesting aspects is the new magic concepts introduced. It makes the already rich magical system even more diverse. The interactions between the characters also take on new dimensions. For example, the way the different factions interact and the alliances that are formed or broken. It's a great addition to the series that keeps fans hooked.